1. Department of Mathematics, Mirpur University of Science and Technology, Mirpur (AJK) 10250, Pakistan
2. Department of Mathematics, Faculty of Science, Jiangsu University, Jiangsu 212013, China
3. Centre for Undergraduate Studies, University of the Punjab, Lahore 54590, Pakistan
4. Faculty of Modern Technologies Engineering, Amol University of Special Modern Technologies, Amol, Iran
5. Department of Mathematics, COMSATS Institute of Information Technology, Lahore, Pakistan
6. Department of Mathematics, Faculty of Science, Cairo University, Giza, Egypt