1. Department of Mathematics, Central University of Jammu, Jammu 180011, India (Corresponding author), e-mail: kamleshkum1984@gmail.com, https://orcid.org/0000-0003-1444-6049
2. Department of Mathematics, Indian Institute of Technology, Roorkee, Uttarakhand 247667, India
3. Department of Mathematics, Birla Institute of Technology & Science, Pilani, Rajasthan, India