1. Department of Mathematics, College of Science, King Khalid University, Abha 61413, Saudi Arabia
2. Department of Mathematics, College of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur 603203, Tamilnadu, India
3. Department of Mathematics, Faculty of Science & Humanities, R.M.K. Engineering College, Tiruvallur 601206, Tamil Nadu, India