1. School of Mathematics, Shri Mata Vaishno Devi University, Katra 182320, J&K, India
2. Department of Mathematics, Shri Mata Vaishno Devi University, Katra 182320, J&K, India
3. Department of Medical Research, China Medical University Hospital, China Medical University (Taiwan), Taichung, Taiwan
4. Department of Mathematics, Aligarh Muslim University, Aligarh 202002, India