Institution: | (1) Faculty of Applied Mathematics, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands;(2) Department of Mathematical Sciences, New Mexico State University, P.O. Box 30001, Las Cruces, New Mexico, 88003-8001;(3) Faculty of Applied Mathematics, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands |