Affiliation: | 1. Institute of Mathematics, University of Warsaw, Banacha 2, 02-097 Warszawa, Poland;2. Department of Mathematical and Statistical Sciences, University of Alberta, Edmonton, Alberta, Canada T6G 2G1;3. Equipe d?analyse et mathématiques appliquées, université Paris Est, 5, boulevard Descartes, Champs-sur-Marne, 77454 Marne-la-Vallee cedex 2, France |