Institution: | 1. Institut für Angewandte Mathematik, Technische Universität Braunschweig, Pockelsstraße 14, 38106 Braunschweig, Germany;2. Department of Mathematics, UMIST, PO Box 88, Manchester M60 1QD,UK;3. Department of Mathematics, University College Chester, Parkgate Road, Chester CH1 4BJ, UK |