1. Department of Mathematics, Vivekananda College 1 , Kolkata 700063, WB, India
2. Department of Mathematics, University of Kalyani 2 , Kalyani 741235, WB, India
3. Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Kolkata 3 , Mohanpur, Nadia, 741246 Kolkata, WB, India