1. Centre for Advanced Studies in Pure and Applied Mathematics, Bahauddin Zakariya University, Multan 60800, Punjab, Pakistan
2. Department of Mathematics, Government Post Graduate College, Bahawalpur, Islamabad, Pakistan,
3. Centre for Advanced Studies in Pure and Applied Mathematics, Bahauddin Zakariya University, Multan, 60800 Punjab, Pakistan,
4. School of Mathematics and Finance, Chuzhou University, Chuzhou, China,