University of Stuttgart (Allemagne) Aug. 94, Nov.-Dec. 1995
University of Ferrara (Italie) May 1996, May 1997
University of Hong-Kong, Sept 1996
University of Stuttgart, Oct-Dec 1997
Inst. Appl. Math & Cybernetics, Nizhny Novgorod, Nov. 98
Cambridge University (UK) Isaac Newton Institute, Aug. 2001
Univ. de Milano Bicocca, Ist. di Alta Matematica, Nov. 2002
Technical University of Denmark, Lyngby, Danemark (June 2003)
Fields Institute, Toronto, Canada (dec. 2003)
Tata Institute, Bangalore, India (Jan 2005)
Univ. of Illinois - Chicago and Purdue Univ. (West-Lafayette) USA (April 2005)
VPNA - SISSA Spring School, Trieste, Italy, May 2005
St Etienne de Tinée, France. Summer school. Aug-Sept 2005
North British Differential Equations Seminar (Dundee, Edinburgh, Heriot-Watt, Glasgow, Strathclyde, St. Andrews, Keele, Leeds, Liverpool, Manchester, Newcastle). October 2006
CIRM, Luminy, France. Research in pair with M.Haragus (Feb 2008)
Nonlinear Summer School, Peyresq, France, Sept 2008 (4h30 lectures)
Hamiltonian PDEs and Dynamical Systems, Univ. Napoli, May 2009 (3-4 lectures)
Winter School, Dynamics and Partial Differential Equations. St Etienne de Tinée, Jan 2010 (3h lectures)
Univ. East Anglia, Norwich, (UK), june 2010
RTNS2012, Univ. Navarra, Pamplona, Spain, Jan 2012 (10h lectures)
Nonlinear Summer School, Peyresq, France, Août 2012 (4h30 lectures)
Winter School, Dynamics and Partial Differential Equations. St Etienne de Tinée, Feb 2013, Feb 2014, Feb 2015, Jan 2016
Summer School of Theoretical Mechanics, Instabilities and Bifurcations in Mechanics, Quiberon, Sept 2015 (7h30 lectures)
Workshop on Hamiltonian PDE's. La Thuile , Italy, feb. 2019.
17th School on Interactions between Dyn.
Systems and P.D.E. Small divisor problems in Fluid Mechanics. june 2019
CRM Barcelona (6h lectures)