1. Department of Applied Sciences & Humanities, Rajkiya Engineering College, Kannauj 209732, India
2. Department of Mathematics, GMR Institute of Technology, Rajam 532127, India
3. Department of Mathematics, School of Advanced Sciences, Vellore Institute of Technology, Vellore 632014, India
4. Department of Basic Science, SRMS College of Engineering & Technology, Bareilly 243001, India