1. Department of Mathematics, Malaviya National Institute of Technology, Jaipur-302017, India
2. Department of Science and Humanities, Kalaniketan Polytechnic College, Jabalpur-482001, India
3. Department of Mathematics, Texas A&M University-Kingsville, 700 University Blvd., Kingsville, USA
4. Department of Mathematics, Wollo University, P.O. Box: 1145, Dessie, Ethiopia
5. Department of HEAS(Mathematics), Rajasthan Technical University, Kota-324010, India