1. International University of Business Agriculture and Technology,Department of Mathematics,Dhaka,Bangladesh
2. International University of Business Agriculture and Technology,Department of Statistics,Dhaka,Bangladessh,India
3. Universiti Tunku Abdul Rahman, Department of Physical and Mathematical Science, Kampar, Perak, Malaysia
4. Universiti Sains Malaysia, School of Mathematical Sciences, Penang, Malaysia
5. Universiti Sains Malaysia,School of Computer Sciences,Penang,Malaysia