1. Department of Mathematics, COMSATS University Islamabad, Vehari Campus, Pakistan
2. Department of Mathematics, COMSATS University Islamabad, Lahore Campus, Pakistan
3. Department of Computer Science and Mathematics, Lebanese American University, Beirut, Lebanon
4. Siirt University, Art and Science Faculty, Department of Mathematics, 56100 Siirt, Turkey
5. Near East University, Mathematics Research Center, Department of Mathematics, Near East Boulevard, PC: 99138, Nicosia/Mersin 10, Turkey