Affiliation: | (1) Mathematical Institute of the Hungarian Academy of Sciences, Reáltanoda U. 13-15, H-1053 Budapest;(2) Department of Mathematics, University of Ottawa, K1N 9B4 Ottawa, Ontario, Canada;(3) Insitut für Mathematische Stochastik Universität Göttingen, Lotzestrasse 13, D-3400, Bundesrepublik Deutschland;(4) Department of Mathematics, University of Illinois, 61 801 Urbana, Illinois, USA |