1. MUHAMMAD ASIM KHAN:
School of Mathematical Sciences, Universiti Sains Malaysia, Malaysia.
2. M. ALI AKBAR:
Department of Applied Mathematics, University of Rajshahi, Bangladesh.
3. NORHASHIDAH HJ. MOHD. ALI:
School of Mathematical Sciences, Universiti Sains Malaysia, Malaysia.
4. MUHAMMAD ABBAS:
Department of Mathematics, University of Sargodha, 40100 Sargodha, Pakistan.