1. School of Science, Bengbu University, Bengbu, Anhui 233030, P. R. China
2. Department of Mathematics & Computing, Indian Institute of Technology (Indian School of Mines), Dhanbad 826004, Jharkhand, India
3. Department of Humanities and Science, Indian Institute of Information Technology Dharwad, Dharwad 580009, Karnataka, India
4. Department of Mathematics, COMSATS University Islamabad, Abbottabad, Pakistan
5. Financial Mathematics and Actuarial Science, (FMAS)-Research Group, Department of Mathematics, Faculty of Science, King Abdulaziz University, P. O. Box 80203, Jeddah 21589, Saudi Arabia