Institution: | 1. Department of Mathematics, Carthage College, 2001 Alford Park Dr, Kenosha, WI 53140, USA;2. Department of Mathematical Sciences, P.O. Box 5190, 1300 Lefton Esplanade, Kent, OH 44242, USA;1. Department of Mathematics, University of Denver, 2390 S. York St., Denver, USA;2. Czech Technical University in Prague, Faculty of Electrical Engineering, Technická 2, 166 27 Prague 6, Czech Republic |