1. Department of Mathematics, Kurukshetra University, Kurukshetra 136119, Haryana, India
2. Department of Mathematics, Seth Jai Parkash Mukand Lal Institute of Engineering and Technology, Radaur 135133, Haryana, India
3. Department of Mathematics, Deen Bandhu Chhotu Ram, University of Science and Technology, Murthal 131039, Haryana, India