Affiliation: | 1.Department of Mathematics, Sikkim Manipal Institute of Technology, Sikkim Manipal University, Majitar, Rangpo, East-Sikkim, 737136, India ;2.Department of Mathematics, Cooch Behar Panchanan Barma University, Cooch Behar, West Bengal, India ;3.Institute for Mathematical Research, Universiti Putra Malaysia, Serdang, Malaysia ;4.Malaysia-Italy Centre of Excellence for Mathematical Science, University Putra Malaysia, Serdang, Malaysia ; |