1. Department of Mathematics, City University of Science and Information Technology, Peshawar, KP 25000, Pakistan
2. Department of Mathematics, Abdul Wali Khan, University, Mardan, KP 23200, Pakistan
3. Department of Mathematics, University of Castilla-La Mancha, Spain
4. Faculty of Computing and Information Technology in Rabigh, King Abdul Aziz University, Jeddah, Saudi Arabia