Muhammad Sajjad Hossain

Department of Arts and Sciences, Ahsanullah University of Science & Technology (AUST), Dhaka-1208, Bangladesh

M. A. Alim

Department of Mathematics, Bangladesh University of Engineering & Technology (BUET), Dhaka-1000, Bangladesh

Kazi H Kabir

Department of Mathematics, Mohammadpur Kendriya College, Dhaka, Bangladesh