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August 2019, Institute of Mathematics of the Romanian Academy (Monthly Colloquium), Bucharest, Romania
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April 2015, University of Saarlandes, Saarbrücken, Germany
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January 2014, Rochester University, Rochester, New York, USA
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January 2014, Vanderbilt University, Nashville, Tennessee, USA
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August 2013, Institute of Mathematics of the Romanian Academy (Monthly Colloquium), Bucharest, Romania
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January 2013, Humboldt University, Berlin, Germany
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December 2011, Free University of Berlin, Berlin, Germany
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July 2011, Institute of Mathematics of the Romanian Academy (Monthly Colloquium), Bucharest, Romania
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December 2010, Institute for Advanced Study, Princeton, New Jersey, USA
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February 2010, Emory University, Atlanta, Georgia, USA
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October 2009, Oklahoma State University, Stillwater, Oklahoma, USA
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November 2006, University of Regina, Regina, Saskatchewan, Canada
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November 2006, University of Toronto, Toronto, Ontario, Canada
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February 2006, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
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February 2006, University of California at Santa Cruz, Santa Cruz, California, USA
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January 2006, University of Illinois at Chicago, Chicago, Illinois, USA
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January 2006, Northeastern University, Boston, Massachusetts, USA
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January 2006, State University of New York at Stony Brook, Stony Brook, New York, USA
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January 2006, University of Bristol, Bristol, UK
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January 2006, University of California at Irvine, Irvine, California, USA
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December 2005, University of Massachusetts at Amherst, Amherst, Massachusetts, USA
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November 2005, University of Minnesota, Minneapolis, Minnesota, USA
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January 2005, Institute of Mathematics of the Romanian Academy (Monthly Colloquium), Bucharest, Romania
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August 2004, Institute of Mathematics of the Romanian Academy, Bucharest, Romania
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December 2002, Brock University, St. Catherines, Ontario, Canada
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November 2001, University of Waterloo, Department of Pure Mathematics, Waterloo, Ontario, Canada
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October 2001, Queen's University, Department of Mathematics and Statistics, Kingston, Ontario, Canada
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