1. Department of Physics, Jadavpur University, Kolkata, West Bengal, India
2. Government General Degree College at Kushmandi, Kushmandi, West Bengal, India
3. Department of Physics, Lady Brabourne College, Kolkata, West Bengal, India
4. Department of Mathematics, Government General Degree College at Kushmandi, Dakshin Dinajpur, Kushmandi, West Bengal, India
5. Department of Mathematics, Visva-Bharati University, Santiniketan, India