1. Department of Mathematics, NIT Warangal, Warangal, Telangana 506004, India
2. Department of S & H, PES University-RR Campus, Bengaluru, Karnataka 560085, India
3. Department of Mathematics, RV Institute of Technology and Management, Bengaluru, Karnataka 560076, India
4. Department of Mathematics, AMC Engineering College, Bengaluru 560011, India