1. Department of Mathematics, International University of Business Agriculture and Technology, Dhaka, Bangladesh
2. School of Mathematical Sciences, Universiti Sains Malaysia, Minden, Malaysia
3. Department of Statistics, Mawlana Bhashani Science and Technology University, Santosh, Tangail, Bangladesh
4. Centre for Global Sustainability Studies, Universiti Sains Malaysia, Minden, Malaysia
5. School of Management, Universiti Sains Malaysia, Minden, Malaysia