1. Department of Mathematics, Government College Women University Faisalabad, Faisalabad 38000, Pakistan
2. Centre for Advanced Studies in Pure and Applied Mathematics, Bahauddin Zakariya, Multan 60000, Pakistan
3. Department of Mathematics, Ghazi University, Dera Ghazi Khan 32200, Pakistan
4. Department of Mathematics and Statistics, Institute of Southern Punjab, Multan 60800, Pakistan
5. Department of Mathematics, University Centre for Research and Development, Chandigarh University, Mohali 140413, India