1. Faculty of Sciences and Mathematics, University of Niš, 18000 Niš, Serbia
2. Laboratory “Hybrid Methods of Modelling and Optimization in Complex Systems”, Siberian Federal University, Prosp. Svobodny 79, 660041 Krasnoyarsk, Russia
3. Department of Mathematics and Informatics, Faculty of Sciences, University of Novi Sad, 21000 Novi Sad, Serbia
4. Department of Information and Electronic Engineering, International Hellenic University, 57400 Thessaloniki, Greece
5. Mathematical Institute, Serbian Academy of Sciences and Arts, Kneza Mihaila 35, 11000 Belgrade, Serbia
6. Faculty of Sciences and Mathematics, University of Pristina in Kosovska Mitrovica, Lole Ribara 29, 38220 Kosovska Mitrovica, Serbia