1. School of Mathematical SciencesUniversiti Sains Malaysia Minden, Penang Malaysia
2. Department of MathematicsInternational University of Business Agriculture and Technology Dhaka Bangladesh
3. Department of Physical and Mathematical Science, Faculty of ScienceUniversiti Tunku Abdul Rahman Kampar Perak Malaysia
4. Department of Quality and LogisticsLUNAM Université, Université de Nantes and LS2N, UMR CNRS Carquefou France