Visited institutes

Universitat Politècnica de Catalunya (Barcelona, Spain).
Research on eigenvalue problems with Marcello Lucia
(January 18–25, 2009).
Mathematisches Institut of the University of Cologne.
Research on convexity with Bernd Kawohl
(April 1–6, 2006;
September 20 – October 10, 1998).
Institut Elie Cartan at Nancy (France).
Research on isoperimetric inequalities and overdetermined problems with Antoine Henrot
(July 12–22, 2005).

Dipartimento di Matematica “Ulisse Dini” and IAGA-CNR at Florence.
Research on star-shapedness with Elisa Francini and Andrea Colesanti
(January 9–21, 2000;
September 15–27, 1997;
February 7–10, 1996).
Département de Mathématiques et de Statistique of the Université Laval (Québec, Canada).
Research on overdetermined problems with Gérard Philippin
(April 2–28, 2000).
Mathematisches Institut of the University of Basel.
Research on blow-up with Catherine Bandle
(March 27 – April 21, 1995).