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A. Kh. Khachatryan, Kh. A. Khachatryan and A. Zh. Narimanyan
Trans. Moscow Math. Soc. 83 (), 183-200.
Abstract, references and article information

Mining and the Circular Economy: Implications for the Minerals and Metals Industries 6 November 2017 — 4:00PM TO 5:30PM Anonymous (not verified) 31 October 2017 Chatham House, London

A New Era for China: Implications for the Global Mining and Metals Industries 18 June 2018 — 9:00AM TO 10:30AM Anonymous (not verified) 8 June 2018 Chatham House, London

Since the turn of the century, China’s demand for resources has dominated global headlines. It’s rapid demand growth through the early 2000s sparked the beginning of the commodities ‘super cycle’, and encouraged a growing Chinese presence in international mining, and in global metals and minerals markets. More recently, its transition toward the ‘new normal’ of slower but higher quality growth has underpinned the sudden slowdown in global commodities demand.

Drawing on China’s domestic ambitions, as set out in the 19th party congress, and on its wider strategic ambitions through the Belt and Road Initiative, the speaker will set out his thoughts on China’s next era of growth, and its likely implications for international mining investment and global metals and minerals markets.

Realizing the Potential of Extractives for Industrial and Economic Development 18 October 2018 — 5:30PM TO 7:00PM Anonymous (not verified) 3 October 2018 Chatham House | 10 St James's Square | London | SW1Y 4LE

Over the past two decades, the extractives industries have risen in importance for many low- and middle- income countries their prospects for economic development and poverty reduction. During a period of rising commodities prices, the development of extractives became increasingly attractive to both governments and companies. There was - and remains - much discussion about their potential to support inclusive development.

However, there are also risks and uncertainties associated with the extractives industries and many things can, and do, go wrong. Fluctuations in commodity prices can be hard to manage and can lead to considerable fiscal pressures. In the longer-term, climate change and the various policy responses to this, will profoundly affect the extractives sector as renewables replace fossil fuels in the global energy mix.

Managing the extractives sectors will therefore remain highly challenging especially in low-income countries where institutions are often weak. This roundtable will bring together some of the foremost academics and practitioners working in the extractives industries and also in economic development to discuss a major new UNU-WIDER study Extractive Industries: The Management of Resources as a Driver of Sustainable Development.

Attendance at this event is by invitation only.

Decarbonizing Heat: A New Frontier for Technologies and Business Models 27 February 2019 — 8:15AM TO 9:45AM Anonymous (not verified) 3 December 2018 Chatham House | 10 St James's Square | London | SW1Y 4LE

Building space and water heating accounts for over 35 percent of global energy consumption - nearly double that of transport. However, there has been limited progress in decarbonizing the sector to date. International cooperation is required to ensure harmonized policies drag low carbon heating technologies down the cost curve to the extent that low carbon heating is cost competitive and affordable. The initial presentations and discussion focus on:

• Demand reduction technologies and policies that speed up transformation of the sector.
• The different challenges for energy efficiency of retrofitting as opposed to new build.
• The impact of electrification on GHG emissions and the power sector.
• The comparative role of national and city level initiatives.

The meeting concludes by looking at the challenges and risks in accelerating the transformation of heating and the lessons that can be learned from other sectors.

The Electric Vehicle Revolution: Impacts on Oil Economies and Industry 24 January 2019 — 8:15AM TO 9:45AM Anonymous (not verified) 3 December 2018 Chatham House | 10 St James's Square | London | SW1Y 4LE

Electric vehicle (EV) deployment is gathering pace: the Norwegian government thinks that EV subsidies will be unnecessary by 2025 as they reach parity with diesel and petrol vehicles.

China has stipulated that EVs comprise 12 per cent of vehicle sales by 2020 while more governments are committing to banning diesel and petrol vehicles.

These developments are expected to be replicated as urban air pollution rises up the political agenda while technological developments and falling costs have given rise to ambitious forecasts on the increase in the deployment of EVs and the demise of the internal combustion engine.

Considering this, the presentations and initial discussion focus on:

• The influence of new technologies on the automotive landscape, including autonomous vehicles.
• How the automotive and oil companies are adjusting their business models to accommodate and encourage the rise in EVs.
• The risks and opportunities for the deployment of EVs for incumbents and new market actors.
• The role of government for example in public procurement and infrastructure development.
• The potential for modal shift and its impact on oil demand.

The discussion then seeks to explore the need for benchmarks of change including data and metrics to understand the changing risk landscape and the implications for different actors.

Finally, the discussion focuses on the speed of transformation and what this means for existing and new market actors.

Driven to Extraction: Can Sand Mining be Sustainable? 5 June 2019 — 1:30PM TO 3:00PM Anonymous (not verified) 29 April 2019 Chatham House | 10 St James's Square | London | SW1Y 4LE

Sino-Russian Gas Cooperation: Power of Siberia I and II and Implications for Global LNG Supplies 27 November 2019 — 8:30AM TO 9:30AM Anonymous (not verified) 19 November 2019 Chatham House | 10 St James's Square | London | SW1Y 4LE

In a new event in the Sustainable Transitions series, the speaker will present an update of Sino-Russian gas cooperation.

To give a comprehensive account of their impact on global liquefied natural gas (LNG) supplies, he will discuss the following points:

• Gas is scheduled to start flowing from the Power of Siberia I (POS) on 2 December 2019. But what is the background of development of POS 1 and what is its current status and prospects?
• What are the chances of exporting gas through the proposed Altai pipeline? Why is the Mongolia export route so significant? And how will it affect the Central Asian Republics and in particular Turkmenistan’s gas export to China?
• What are the implications of both POS I and Altai gas via Mongolia route in the context of global LNG supply?
• What are the prospects for multilateral pipeline gas cooperation in northeast Asia?
• What are the implications for other Arctic onshore LNG supply, in particular, for Novatek’s Yamal LNG and Arctic LNG 1 and 2 to China on top of POS 1 and Altai gas?

Attendance at this event is by invitation only.

Impact of the US Election on Global Climate Politics 25 November 2020 — 1:00PM TO 2:00PM Anonymous (not verified) 16 November 2020 Online

Panellists discuss how Joe Biden’s victory will impact international efforts to tackle climate change. Will climate finally become a common area for global cooperation?

Joe Biden’s victory over Donald Trump is already having a positive impact on international efforts to tackle climate change. Leaders from across the world, including the UK, Canada, Australia and Fiji, have used their first messages to the President-elect to draw attention to the climate crisis.

Biden has promised to re-join the global community in its commitment to the Paris Agreement – but this could be the easy part. More difficult will be whether and how Biden is able to deliver his ambitious climate plan, and how effectively he is able to integrate climate change into foreign policy efforts and national security strategies.

Global climate action has also moved forward in the last four years. The European Union recently pledged to become climate neutral by 2050, and China, Japan and South Korea have committed to achieving carbon neutral economies.

How will the US re-enter this global landscape of distributed leadership and what difficulties does it face? Will the US be willing to work within a competitive partnership with the EU and China? How will Biden’s win change the dynamic of COP26 next year? 

Sand: Monitoring and management for a sustainable future 2 March 2021 — 1:00PM TO 2:00PM Anonymous (not verified) 18 February 2021 Online

In partnership with the Global Sand Observatory Initiative, this event outlines the sand challenge, what actions are currently underway to address it, and what else needs to be done.

Please complete your registration on Zoom:

After water, sand is the raw material that the world consumes in the greatest quantity. It is no exaggeration to say that fine sand and coarser materials – the medium-to-coarse-grained pebbles, gravel and rock fragments used in construction – are the building blocks of the modern world.

When bound with cement, sand becomes concrete; when mixed with bitumen, it becomes asphalt; and when heated, it becomes glass. Without sand, we would have no highways, high-rises or high-speed trains. Yet sand – which is used here as shorthand for sand, gravel and crushed rock together – is a resource that is both abundant and finite.

In global terms, it is abundant, especially when compared with many other raw materials, albeit often not available close to where it is needed. It is finite in that the rate at which we are using it far exceeds the natural rate at which it is being replenished by the weathering of rocks by wind and water.

Industrialization, population growth and urbanization have fuelled explosive growth in the demand for sand. Precise data on sand extraction are hard to come by and the lack of data compounds the challenge of managing the resource sustainably.

However, the UN estimates that overall extraction could be in the region of 40 billion tonnes per year, driven primarily by construction sector demand. That equates to 18 kilograms of sand each day for every person on the planet and signals how strategically important these resources are for future sustainable development. Post-COVID-19 recovery investment in infrastructure, digital technologies, tourism and other economic activities are dependent on sand resources.

Current efforts to improve the management of sand resources at local, national and global levels are uneven. This is partly due to unique geological features and geography, but also differences in local manifestations of the ‘sand challenge’, national and regional demand for sand resources, as well as capacities to enforce or implement best practice assessment procedures, extractive practices, environmental management and restoration requirements.

We must put stronger conditions in place for a rapid, just and scaled transition to sustainable sand management. But where to focus our efforts for the greatest positive impact?

From local to global: A roadmap for US climate action 14 April 2021 — 6:30PM TO 8:00PM Anonymous (not verified) 28 March 2021 Online

Ahead of Biden’s Earth Day Summit, panellists discuss a range of climate issues, from city-level climate management to the international security implications of climate deals.

On their first day in office, the Biden-Harris administration sent a strong message to Americans and allies by rejoining the Paris Agreement. Experienced climate and environmental leaders were appointed to senior leadership roles as part of a ‘whole of government approach’ to climate action.

Although decisive action is welcomed by many Americans and international partners, the divided domestic perspectives on climate and a changed international landscape pose significant challenges.

Ahead of the Earth Day Summit on April 22, an event hosted by Joe Biden to mark America’s formal return to global climate talks, panellists discuss a range of climate issues, from city-level climate management to the international security implications of climate deals.

• How will post-COVID domestic priorities and policy influence the international approach of the US to climate action?
• How will US policy, both foreign and domestic, need to respond to the security and geopolitical elements posed by climate change?
• What actions are needed during the upcoming Earth Day Summit for the US to establish credibility as a climate leader?
• What shape are key debates taking on US-China climate relations ahead of COP 26, and how might climate issues be approached in relation to wider geopolitical tensions?

Prioritizing equity and justice in climate action 30 June 2021 — 11:00AM TO 12:00PM Anonymous (not verified) 10 June 2021 Online

London Climate Action Week event: Why understanding equity and justice is essential to the ability to meaningfully inform climate politics.

Citizen-led climate activism is demonstrating the need to think about climate change ‘not just as a problem for science to solve’ but also as a problem of equity, human rights and justice.

The disproportionate impacts of climate change on the poor and the marginalized across the world means that understanding equity and justice is essential for the ability to meaningfully inform climate politics.

Excluding these issues risks ignoring, or intentionally omitting, the consequences of policies, tools and frameworks on those who are most likely to face the severe costs of any climate action or inaction.

In a pivotal year for climate decision-making, this event explores the necessity of equity and justice in climate action and how the world can move the political conversation to one that is more inclusive.

The speakers explore how communities themselves articulate the justice dimensions of climate change and how fairness can create a greener future for current and future generations.

This event is being hosted as a part of Strengthening Climate Diplomacy, a series of events from Chatham House during London Climate Action Week 2021.

What does sustainable agriculture mean? 24 May 2022 — 5:30PM TO 6:30PM Anonymous (not verified) 11 May 2022 Chatham House and Online

Experts compare and contrast visions of ‘sustainable’ agriculture.

There is growing and unprecedented recognition of the adverse effects of food systems on global warming, air and water pollution, biodiversity, soil, and managing the emergence and spread of infectious diseases. At the same time, concern is rising over the role of climate change itself in compromising food security, supply-chain resilience and food price spikes.

Against this backdrop, the need for agriculture to become more ‘sustainable’ is clear. However, there is little consensus over what that means in practice. To address this, Chatham House is launching a new research paper comparing and contrasting the two most commonly articulated versions of ‘sustainable agriculture’.

The first focuses on sparing land for nature and increasing the productivity of agricultural land while minimizing environmental impacts. The second involves scaling up nature-friendly farming while emphasizing demand-side changes to reduce the overall pressure on land.

• How can we understand the arguments in support of either version and the assumptions and ideologies which underpin them?

• What are the implications of promoting one version of agriculture over the other

• How can policy transform agriculture and food systems?

• What should civil society support as ‘sustainable’ choices?

Root Causes of Rohingya Crisis Must Not be Ignored Expert comment sysadmin 28 September 2017

The focus on Aung San Suu Kyi masks the complete lack of an adequate response to the crisis in Myanmar, whether at the global or regional level.

Aung San Suu Kyi’s recent speech on the Rohingya crisis was - at best - light on details on how the current situation could be remedied and - at worst - full of easily disproven assertions.

While she does not directly control the military, it is her government that is blocking humanitarian access to the areas affected by the violence. And the Rohingya have faced systemic persecution and discrimination for decades.

Some may argue this is simply realpolitik and that any public support for the Rohingya could mean facing a backlash from the military and a large part of her support base. But arguably, she does have moral authority (which helped her in the past to stand up to the military generals) that is now being eroded by her ambivalence in speaking out.

However, the focus on Aung San Suu Kyi masks the complete lack of an adequate response to the crisis – whether at the global or regional level.

Undertaking dangerous and perilous journeys

Since the attacks on border and military posts by the armed group Arakan Rohingya Salvation Army (ARSA) in August 2017, there has been a strong military crackdown against the Rohingya in Rakhine state: a substantial number of Rohingya villages destroyed; close to half a million people Rohingya fleeing into Bangladesh and tens of thousands internally displaced within Myanmar.

Prince bin Ra’ad , UN High Commissioner for Human Rights, has called the crisis a “textbook example of ethnic cleansing” and tens of thousands of Rohingya are still undertaking dangerous and perilous journeys seeking sanctuary. In response, the UN and EU have focused on addressing the immediate humanitarian crisis in Bangladesh, which is already home to many formerly displaced Rohingya communities.

Within the region, Sheikh Hasina’s secular Awami League government in Bangladesh initially proposed joint military operations with Myanmar against the ARSA - in part because of concerns about the long standing relationship between Rohingya political or armed groups and the Jamaat-e-Islami, an ally of the main opposition Bangladesh Nationalist Party (BNP).

However, faced with massive refugee flows, Bangladesh turned its focus to the humanitarian crisis while stressing that Myanmar must allow the return of refugees. Bangladesh’s concern is partly motivated by internal security concerns. If the current situation becomes protracted, with no clear resolution in sight, frustration could create the conditions for further radicalisation within Rohingya communities.

The Association of South East Asian Nations (ASEAN) has yet to come to grips with the situation. Despite its mandate to ensure peace and stability within the region, its policy of non-interference and consensus trumps the need to secure and maintain stability. Instead countries have responded bilaterally - for example, Indonesia sent its foreign minister to both Myanmar and Bangladesh while Malaysia has been consistently vocal about its concerns.

So this raises broader questions on the effectiveness of ASEAN. Currently celebrating its 50th anniversary, ASEAN needs to decide how to mediate and resolve issues with regional implications as its principle of non-intervention effectively blocks any constructive discussion on the Rohingyas ongoing statelessness and impact of this on the region.

However, there is also an opportunity here for ASEAN to consider how mediation and negotiation could potentially manage such crises. And there is a historical precedent: the 1989 Comprehensive Plan of Action on Indo-Chinese refugees saw cooperation between recipient countries in the region and the international community on how to resettle Vietnamese refugees (although Cold War considerations did play a part in that specific crisis).

India and China have both backed Myanmar, reflecting their economic and security interests in the country but also motivated by each wanting to contain the influence of the other within Myanmar. Rakhine is important with its natural resources and coastal location and, as China is not directly affected by the refugee crisis, it has less to lose than others in standing by Aung San Suu Kyi and her government.

India is nearing completion of the Kaladan Multi-modal Transit Transport Project, connecting the Bay of Bengal with the northeast Indian state of Mizoram, and sees Myanmar as an important market for its regional ambitions. For parts of the Indian administration, the crisis plays to a domestic narrative that some of the Rohingya already settled in Jammu and Kashmir have links to armed groups in Pakistan and are an internal security concern.

So while India is providing humanitarian aid to Bangladesh, it is also threatening to deport almost 40,000 Rohingya. The case is currently being heard at the Indian Supreme Court, but given that the Rohingya lack citizenship in Myanmar, it is not clear to where they would be deported.

Myanmar, ASEAN and other affected countries need to show political will to find a solution to the Rohingya’s long-standing issue of statelessness - discrimination was legally formalised in a 1982 Burma Citizenship Law, which recognised 135 ethnicities for citizenship but excluded the Rohingya.

The root causes of this crisis – long standing discrimination, persecution and lack of citizenship – cannot be ignored. There is a need for a comprehensive peace process, which recognises the ethnic and religious diversity within Myanmar.

And incentives, such as improving infrastructure, access to services and livelihoods, may also be needed to ensure there is a lasting solution that allows the Rohingya return and thrive as part of Myanmar society.

Without such a response, it is difficult to see an end to the current impasse.

The Migration-Deportation-Return Nexus 6 June 2018 — 1:00PM TO 5:30PM Anonymous (not verified) 23 May 2018 Chatham House, London

In 2015, the unprecedented numbers of migrants crossing borders subjected the EU to extraordinary moral and political pressure, as the number of asylum-seekers soared 122 per cent to 1.3 million people.

In response, the EU has sought to accelerate the deportation of failed asylum-seekers and migrants who arrive without proper documentation. The European Commission has recommended that “all leverage and incentives” be used to “ensure that third countries fulfil their international obligation to take back their own nationals residing irregularly in Europe.”

The Valletta Action Plan, the EU-Turkey deal, the Brussels Agreement with Afghanistan, the EU deal with Nigeria and the new “results-oriented Partnership Framework” signal more restrictive approaches and an outsourcing of the securitization of migration.

However, the EU’s attempt to reconcile its legal and humanitarian obligations with stronger measures has encountered some serious challenges.

This roundtable stimulates dialogue on the circumstances surrounding migrant youth both in Afghanistan and the Edo state in Nigeria, and identifies key questions for further research on the ground.

Contextualising young people’s experiences within a “migration-deportation-return” nexus provides an entry point for the identification of both the commonalities and specifics of the challenges and risks that migrant youth face.

In line with UNICEF’s policy priorities related to children on the move, and initiating global debates in child rights and development, this collaboration forms part of the efforts that seek to inform global research and policy agenda for this most vulnerable of groups under the radar.

The intended outcome of this collaboration is to begin developing a set of core objectives and indicators to help guide the EU, Afghanistan and Nigeria in their treatment of youth, and to facilitate improved donor and host government understanding of the issues.

Participants include experts, researchers, academics, representatives of civil society and governmental institutions.

Attendance is by invitation-only.

The event is co-hosted with UNICEF Office of Research – Innocenti and the University of Cambridge.

Webinar: Hong Kong: Dissent in the Age of Coronavirus 17 April 2020 — 12:00PM TO 1:00PM Anonymous (not verified) 8 April 2020

Street protests demanding greater autonomy and democratization in Hong Kong upended the city for seven months last year. However, with the outbreak of the coronavirus in China in late January, the protests quickly died out. What does this mean for the city’s protest movement?

The speaker will argue that, despite the lack of high-profile street rallies, protest in the city is continuing. It is building on and evolving from last year’s protest movement albeit in different forms. At the same time, the Hong Kong authorities, emboldened by a hard line from Beijing, have begun cracking down on activists and protesters in the city as they seek to put a lid on dissent ahead of important Legislative Council elections scheduled for this September.

In this webinar, the speaker will look at the current state of dissent in Hong Kong and prospects for Hong Kong’s future.

This event will be held on the record.

Torin Greenwood, Jonathan Kariv and Noah Williams
Math. Comp. 93 (), 2959-2983.
Abstract, references and article information

Constantin Carle and Marlis Hochbruck
Math. Comp. 93 (), 2611-2641.
Abstract, references and article information

Buyang Li, Zongze Yang and Zhi Zhou
Math. Comp. 93 (), 2557-2586.
Abstract, references and article information

Stacey Finley from University of Southern California discusses how mathematical models support the research of cancer biology. Cancer research is a crucial job, but a difficult one. Tumors growing inside the human body are affected by all kinds of factors. These conditions are difficult (if not impossible) to recreate in the lab, and using real patients as subjects can be painful and invasive. Mathematical models give cancer researchers the ability to run experiments virtually, testing the effects of any number of factors on tumor growth and other processes — all with far less money and time than an experiment on human subjects or in the lab would use.

Ning Jiang, Yi-Long Luo and Shaojun Tang
Trans. Amer. Math. Soc. 377 (), 5323-5359.
Abstract, references and article information

Time: 9:00 AM, Location: E2.010

dannyhennesy posted a photo:

On the Capital planet the rebellious droids had followed maily the Bat-Bot, but as time progressed his circuits had gone all mushy at 780 years or so without maintenance…

Several splinter groups all with their local bot leaders emerged such as the Che-bot, the traffic-light-robot and the Butt-bot, but none of these collected enough sentient circuits to call themselves a popular (or Animata) mass movement!

That was until a cyborg came along, one known as Jones, a long time prisoner and terrorist, his easy solutions to every problem rang well in the masses' auditory circuits!!!

His slogans and simple rhetoric were simple enough for the simple traffic-light to comprehend and cheer!

His language was full of hate towards the organics and especially the humans who were the most common races among the ruling class of the federation!!!

Despite being a “Fleshie” himself his message collected the angry enslaved
bot community by only weeks all rebellious robots except for a few fringe loonies had forgotten the old leaders…

One morning at Jones gave the signal…

All over the capital planet hordes and swarms of any form of mechanical sentient beings attacked first the police stations, then the Company boards running the planet and the federation as well as their starfleet…

Many died, especially the low level police and army! Many mechanicals died too, but their ranks were soon filled by Mutant fleshie allies of the lower levels who hated the Federation feudal society and upper classes as much as their technological allies…

The Federation state apparatus and ruling class, most of their fleet army fled when they knew the game was up, they activated the emergency escape plan and whole city blocks with important factories, administrational units, valuable assets and so on separated from the capital by hidden rocket engines and homed in their course to Mars…

On Mars the federation regrouped and formed their new society…

On the Capital planet, the robots proclaimed the first Techno-republic of the advanced inorganic civilization, the low level fleshies left behind, became slaves and their mutant allies got to rule their own minute chiefdoms as protectorates under the Techno-republic…

Jones was now the undisputed ruler of the capital planet, but the victory was a pyrros one since, all important buildings, all of value was now one Mars!

But as Jones put it:

Our proud race the Techno-species didn’t need the Fleshies administration, their infrastructure, their spaceships…

We shall start from scratch, with a new administration, a new order, every droid shall work at 4x speed than they did during human oppression since now we are free and the fleshies shall work twice as hard than the Techno-Race, until we have breed enough new fleshies so they can do all work!

Our future is bright and shiny like glistering shiny metal!

The snapshot seen here is from the first police station attacked in sector 45-34v-ss-g the first one to fall according to official techno-history!

———————————————/
Designers note:

I am sad to say that this is the last episode in this years-spanning space series… At least for a while, I will still post LEGO hobby stuff here but without a storyline, perhaps small designs and builds… and occasionally a story when I feel like it!!!

I would like to thank all who had been in this journey of our heros, but it has taken far to much time and effort and since the state of the world is as it is, I am spiraling down in another depression, I must stop it before I reach the abyss, so I have remove some stress out of my equation… I ended it in a cliffhanger so I can easily restart it when my mental health improves… I hope that won’t be forever???

I would love if someone used my characters or ideas, please send me a link if you do, I would love to read it or look at it!!!

But there will be more Lego, just in different format without long stories, I need to focus more on my art and to be honest that is the only time the mental pain eases, when I create!!!


Peace and Noise!

MushroomBrain a FOL

WendyHarris1955 posted a photo:

unbranded
plywood (basswood)
175 pieces
280 x 350 mm

TED: "I fink this lickle cat an' tiger pussle's cute. It's got pussycat wimsys an' it's shaped, so it's gonna be a keeper. The wobbly edj wuz a bit fiddly an' I 'ad to check the pikchur to make shure I 'ad it rite, but uvverwise it's a good'un.
That peece of cake I'm abowt to eat is Mum's 'ome-made froot cake spredd wiv butter - s'nice cuz she puts whisky in it. That's the cake, not the butter!"

Claudio Macci and Barbara Pacchiarotti
Theor. Probability and Math. Statist. 111 (), 21-43.
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Chris A.J. Klaassen
Theor. Probability and Math. Statist. 111 (), 9-19.
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Shengyu Tang
Proc. Amer. Math. Soc. 152 (), 5381-5394.
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Xiaoshang Jin
Proc. Amer. Math. Soc. 152 (), 5327-5337.
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Anh Tuan Nguyen, Tómas Caraballo and Nguyen Huy Tuan
Proc. Amer. Math. Soc. 152 (), 5175-5189.
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Rubén Medina and Andrés Quilis
Proc. Amer. Math. Soc. 152 (), 5137-5148.
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N. Lebedeva and A. Petrunin
St. Petersburg Math. J. 35 (), 473-476.
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