Affiliation: | 1. Program in Applied and Computational Mathematics, Princeton University, Fine Hall, Washington Road, Princeton, NJ 08544-1000, USA;2. Faculty of Mathematics, Bielefeld University, Universitaetsstrasse 25, 33615 Bielefeld, Germany;3. Department of Mathematics and Statistics, Purdue University, 150 N. University St., West Lafayette, IN 47907-2067, USA |