1. Department of Physics, G. B. Pant University of Agriculture & Technology, Pantnagar-263145, Uttarakhand, India
2. Department of Mathematics, D. S. B. Campus, Kumaun University, Nainital-263001, Uttarakhand, India
3. Department of Mathematics, Faculty of Arts and Sciences, Recep Tayyip Erdoğan University, 53100 Rize, Turkey
4. Department of Mathematics, Faculty of Arts and Sciences, Yildiz Technical University, 34220 Istanbul, Turkey