1. Department of Mathematics, Faculty of Science, Jazan University, Jazan, Saudi Arabia
2. Near Nehru Training Centre, H. No. 274, Nai Basti B-14, Bijnor-246701, Uttar Pradesh, India
3. Faculty of Sciences and Mathematics, University of Priština, Lole Ribara 29, 38 220 Kosovska Mitrovica, Serbia