Visiting scholar:
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1992, 1992, 1993, 1994, 1995, 1996, 2001, 2001, 2002, 2003, 2004, 2005, 2005, 2006, 2007, 2008, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017
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University of Maryland at College Park, Department of Mathematics / Institute for Physical Science and Technology, USA
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1992
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Università degli Studi di Milano, Dipartimento di Matematica, Italy.
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1993-1994, 1996-1998
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Freie Universität Berlin, Fachbereich Physik, Germany.
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1994, 1998, 2007
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Université de Nantes, Département Mathématiques, France.
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1995
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Università degli studi di Lecce, Dipartimento di Fisica, Italy.
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1998, 1999, 2001, 2002, 2003, 2003, 2004, 2004, 2005, 2006, 2006, 2007, 2008, 2010, 2011, 2011, 2013, 2013, 2014, 2014, 2014, 2015, 2015, 2016, 2016, 2017, 2017, 2017, 2018, 2018, 2019, 2019
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Università Roma-1 "La Sapirnza", Dipartimento di Fisica, Italy.
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2000, 2000, 2001
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Technische Universität Berlin, Institut für Mathematik, Germany.
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2004
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Michigan State University, Department of Mathematics, USA.
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2009, 2010, 2010, 2011, 2013, 2014, 2015, 2015, 2016, 2017, 2017, 2017, 2018, 2018
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Università di Bologna, Dipartimento di Matematica, Italy.
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2011, 2012, 2014, 2016, 2018
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Ecole Polytechnique, Paris, France.
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2012
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Hausdorff Research Institute for Mathematics, Bonn, Germany.
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2012, 2014, 2016, 2018
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Universidad Autónoma del Estado de Morelos, Centro Internacional de Ciencias, Cuernavaca, Mexico.
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2015, 2017, 2019
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Institute Des Hautes Études Scientifiques, Paris, Frace.
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2018
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Institute of Mathematics, Academia Sinica, Taipei, Taiwan.
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