1. Department of Mathematics, National Institute of Technology Puducherry, Karaikal-609609, India
2. Institute for the Future of Knowledge, University of Johannesburg, P.O. Box 524, Auckland Park 2006, South Africa
3. Department of Mathematics, College of Science and Humanities in Alkharj, Prince Sattam Bin Abdulaziz University, Alkharj 11942, Saudi Arabia
4. School of Technology, Woxsen University- Hyderabad-502345, Telangana State, India