1. Department of Mathematics, Sri Eshwar College of Engineering, Coimbatore 641202, Tamil Nadu, India
2. Department of Mathematics and Computer Applications, PSG College of Arts and Science, Coimbatore 641014, Tamil Nadu, India
3. Department of Mathematical Sciences, College of Sciences, Princess Nourah Bint Abdulrahman University, P.O. Box 84428, Riyadh 11671, Saudi Arabia
4. Department of Mathematics and Statistics, Manipal University Jaipur, Jaipur 303007, Rajasthan, India