| Affiliation: | 1. Simion Stoilow Institute of Mathematics of the Romanian Academy, P.O. Box 1-764, 014700 Bucharest, Romania;2. Vrije Universiteit Brussel, Pleinlaan 2, B-1050 Brussels, Belgium;3. Faculty of Mathematics and Computer Science, University of Bucharest, Str. Academiei 14, RO-010014 Bucharest 1, Romania;1. University of Turin, Department of Mathematics “G. Peano”, via Carlo Alberto 10, I-10123 Torino, Italy;2. University of Ferrara, Department of Mathematics and Computer Science, Via Machiavelli 30, Ferrara, I-44121, Italy;1. University of Missouri-Columbia, Mathematics Department, Columbia, MO, USA;2. College of the Ozarks, Mathematics Department, Point Lookout, MO, USA;1. Department of Mathematics, Bar-Ilan University, Ramat Gan, Israel;2. Department of Mathematics, Ben-Gurion University, Beer-Sheva 84105, Israel;1. Department of Mathematics, University at Buffalo, 244 Mathematics Building, Buffalo, NY 14260-2900, USA;2. Department of Mathematics and Statistics, Masaryk University, Kotlá?ská 2, 611 37 Brno, Czech Republic;1. The Ohio State University at Lima, Lima, OH, USA;2. Università di Camerino, Camerino, Italy |
