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. Saurabh Manro, School of Mathematics and Computer Application, Thapar university Patiala, India
E-mail: sauravmanro@hotmail.com

Dr. Janpou Nee, Associate Professor, Chien-Kuo Technology University, Taiwan
E-mail: jpnee@ctu.edu.tw

Dr. Ayman Shehata Mohammed Ahmed Osman El-Shazly, Department of Mathematics, Faculty of Science, Assiut University, 71516-Assiut, Egypt
E-mail: drshehata2006@yahoo.com, drshehata2009@gmail.com