1. Department of Mathematics and Statistics, Faculty of Science, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia
2. Laboratory of Computational Statistics and Operations Research, Institute for Mathematical Research, Universiti Putra Malaysia, Serdang 43400, Selangor, Malaysia
3. Institute of Engineering Mathematics, Universiti Malaysia Perlis, Pauh Putra Main Campus, Arau 02600, Perlis, Malaysia
4. Nottingham University Business School, Faculty of Arts and Social Sciences, University of Nottingham Malaysia, Semenyih 43500, Selangor, Malaysia