Affiliation: | 1.Department of Mathematics, Siksha Bhavana, Visva Bharati University, 731235, Santiniketan, India ;2.Department of Mathematics, Sikkim Manipal University, Sikkim Manipal Institute of Technology, Majitar, 737136, Rangpo, East-Sikkim, India ;3.Department of Mathematics, Gushkara Mahavidyalaya, 713128, Guskhara, West Bengal, India ; |