1. Department of Mathematics, Agri Ibrahim Cecen University, Agri, Turkey
2. Department of Software Engineering, Faculty of Engineering and Architecture, Nisantasi University, Istanbul, Turkey
3. Department of Mathematics, Kahramanmaras Sütçü Imam University, Kahramanmaras 46100, Turkey
4. Dipartimento di Matematica e Informatica, Universitá di Catania, Viale Andrea Doria, 6, Catania 95125, Italy