1. Patha Bhavana, Visva-Bharati, Santiniketan, W.B., India
2. Department of Mathematics, Mugberia Gangadhar Mahavidyalaya, Purba Medinipur, W.B., India
3. Department of Mathematics, National Institute of Technology, Durgapur, W.B., India
4. Department of Applied Mathematics with Oceanology and Computer Programming, Vidyasagar University, Midnapore, W.B., India