| Affiliation: | 1. Department of Mathematics, University of Craiova, Craiova, Romania;2. Department of Mathematics, Eastern Mediterranean University, Famagusta, TRNC, Mersin 10, Turkey;1. Department of Mathematics, Faculty of Science and Technology, Tokyo University of Science, 2641 Yamazaki, Noda-shi, Chiba, 278-8510, Japan;2. Department of Creative Engineering, National Institute of Technology, Kushiro College, 2-32-1 Otanoshike-Nishi, Kushiro-Shi, Hokkaido 084-0916, Japan;1. Département de Mathématiques, Université Libre de Bruxelles, Boulevard du Triomphe, 1050 Brussels, Belgium;2. Dipartimento di Matematica, Università di Roma La Sapienza, P. le A. Moro 2, 00185 Roma, Italy;3. Dipartimento di Matematica “Giuseppe Peano”, Università di Torino, Via Carlo Alberto 10, 10123 Torino, Italy |
