Numerous courses and seminars at various universities and research centres. These include: Aarhus, Cambridge, Lund, Copenhagen, Bell Telephone Labs (New Jersey), Berkeley, University of Tennessee, Trieste, Barcelona, Madrid, Hawaii, Linz (Austria), Berlin, IBM (New York), Riken, Frankfurt, London, Bern, Oak Ridge, Vienna, Helsinki, Kyoto, Zurich, Bariloche, Coimbra, Paris, Brookhaven (USA), Columbia, Rutgers, Stuttgart, York, Grenoble, NY University, Lausanne, Marburg, Kiel, Bielefeld, Strasbourg.
