1. Department of Mathematics, COMSATS University Islamabad, Vehari, Pakistan
2. Department of Mathematics, COMSATS University Islamabad, Lahore, Pakistan
3. Art and Science Faculty, Department of Mathematics, Siirt University, Siirt, Turkey
4. Department of Computer Science and Mathematics, Lebanese American University, Beirut, Lebanon
5. Department of Mathematics, Dambi Dollo University, Dambi Dollo, Ethiopia