Affiliation: | 1. Faculty of Mathematics and Computer Science, Babe?-Bolyai University, 400084 Cluj-Napoca, str. M. Kog?lniceanu, nr. 1, Romania;2. Eötvös Loránd University, Faculty of Informatics, H-1117 Budapest, Pázmány P. sny 1/C, Hungary;1. Department of Mathematics, Sogang University, Seoul, Republic of Korea;2. Department of Mathematical Sciences, KAIST, Daejeon, Republic of Korea;1. School of Mathematical Sciences, Xiamen University, Xiamen, China;2. Department of Mathematics, University of Auckland, Auckland, New Zealand;1. Department of Applied Mathematics, Ulyanovsk State University, Ulyanovsk 432970, Russia;2. Dipartimento di Ingegneria, Università di Palermo, Viale delle Scienze, Ed. 8, 90128 Palermo, Italy |