1. Associate Professor and Head of Mathematics Dept., American International Univ.–Bangladesh, Banani, Dhaka 1213, Bangladesh (corresponding author).
2. Professor, Dept. of Mechanical Engineering, PN Engineering College, PNS Jauhar National Univ. of Sciences and Technology, NUST Habib Ibrahim Rehmatullah Rd., Karsaz, Karachi 75350, Pakistan.
3. Assistant Professor, Dept. of Mathematics, American International Univ.–Bangladesh, Banani, Dhaka 1213, Bangladesh.
4. Dean and Professor, School of Mathematical Sciences, Universiti Sains Malaysia, 11800 Penang, Malaysia.