1. Department of Science, The Bhopal School of Social Sciences, Bhopal, M.P., India
2. Department of Mathematics, Government College, Timarni, M.P., India
3. Faculty of Technical Sciences, University of Priština-Kosovska Mitrovica, Kosovska Mitrovica, Serbia
4. Department of Mathematics, State University of Novi Pazar, Novi Pazar, Serbia