1. Department of Mathematics, Bajkul Milani Mahavidyalaya, Purba Medinipur, India
2. Department of Mathematics, Triveni Devi Bhalotia College, Paschim Bardhaman, India
3. Department of Mathematics, University of Gour Banga, Malda, India
4. Department of Applied Mathematics, Vidyasagar University, Midnapore, India