International collaboration
Courant Institute of Mathematical Sciences
New York University
251 Mercer Street
New York, N.Y. 10012-1185
University of Cambridge
Department of Applied Mathematics and Theoretical Physics,
Cambridge, CB3 0WA, UK
Department of Mathematics and Materials Research Institute, Penn State University, University Park, PA-16802-6401, 218 Mc Allister Building, USA
Technische Universität Darmstadt, FB Mathematik, AG 6Universite de Pau et des Pays de l'Adour,
Pay, France
Université Paris Diderot-Paris 7, 9 - 15 espl. des Grands Moulins,
Narvik University College