| Affiliation: | 1. Department of Mathematics, Virginia Polytechnic Institute and State University, Interdisciplinary Center for Applied Mathematics, Blacksburg, VA 24061-0123, USA;2. Programs in Mathematical Sciences, The University of Texas at Dallas, Richardson, TX 75083-0688, USA;1. Al.I. Cuza University and Octav Mayer Institute of Mathematics, Romanian Academy, Blvd. Carol I, No. 8, 700506 Iaşi, Romania;2. Department of Mathematics, University of Bologna, Piazza di Porta S. Donato 5, 40126 Bologna, Italy;3. Institute of Mathematical Statistics and Applied Mathematics of the Romanian Academy, Calea 13 Septembrie 13, 050711 Bucharest, Romania |
