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Gleb Koshevoy (Russian Academy of Siences), Feb-March, 2017.
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Shmuel Friedland (University of Illinois at Chicago), one week in May 2017.
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Zheng Qu (Hong Kong University), June-July 2017
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Zheng Hua (Hong Kong University), June-July 2017
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Rajendra Bhatia (Indian Statistical Institute, New Delhi),
1 week in Dec 2017.
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Floris Claassens (University of Kent), 1 week in Dec 2017.