1. Department of Mathematics, College of Engineering and Technology, SRM Institute of Science and Technology, Kattankulathur, Tamil Nadu-603 203, India
2. Department of Mathematics, Thiruvalluvar University, Vellore, Tamil Nadu-632 115, India
3. Department of Mathematics, National Institute of Technology Warangal, Telangana-506004, India
4. Department of Mathematics, Faculty of Science, Maejo University, Chiang Mai-50290, Thailand
5. Department of Computer Science, King Khalid University, Abha-62529, Saudi Arabia