Dr. Hasibun Naher, Assistant Professor, Department of Mathematics and Natural Sciences, BRAC University, Bangladesh
E-mail: hasibun06tasauf@gmail.com

Dr. V. Ananthaswamy, Assistant Professor, Department of Mathematics, The Madura College (Autonomous), Madurai, Tamil Nadu, India
E-mail: ananthu9777@gmail.com

Dr. Mohamed Abd El Hamid Seddeek, Department of Mathematics, Faculty of Science, Helwan University, Cairo 11785, Egypt
E-mail: seddeek_m@hotmail.com