Affiliation: | 1.Department of Mathematics and Computer Science, Avram Iancu University of Cluj-Napoca, 400380, Cluj-Napoca, Romania ;2.Romanian Institute of Science and Technology, 400487, Cluj-Napoca, Romania ;3.Department of Mathematical Analysis and Numerical Mathematics, Faculty of Mathematics, Physics and Informatics, Comenius University in Bratislava, Mlynská dolina, 842 48, Bratislava, Slovak Republic ;4.Mathematical Institute, Slovak Academy of Sciences, ?tefánikova 49, 814 73, Bratislava, Slovak Republic ;5.Department of Electronic Engineering, City University of Hong Kong, Hong Kong, China ; |