1. Department of Mathematical Sciences, Faculty of Science, Universiti Teknologi Malaysia, 81310 Johor Bahru, Malaysia
2. Azman Hashim International Business School, Universiti Teknologi Malaysia, 81310 Johor Bahru, Malaysia
3. Centre of Sustainable Nanomaterials, Ibnu Sina Institute for Scientific and Industrial Research, Universiti Teknologi Malaysia, 81310 Johor Bahru, Malaysia