Dr. Hasibun Naher, Lecturer in Mathematics, Department of Mathematics and Natural Sciences, BRAC University, 66 Mohakhali, Dhaka-1212, Bangladesh
E-mail: hasibun06tasauf@gmail.com; hasi@bracu.ac.bd

Dr. Vishnu Narayan Mishra, Assistant Professor of Mathematics, Applied Mathematics & Humanities Dept., Sardar Vallabhbhai National Institute of Technology, Gujarat, India
E-mail: vishnunarayanmishra@gmail.com