1. Department of Fundamental and Applied Sciences, Universiti Teknologi PETRONAS, 32610 Seri Iskandar, Perak, Malaysia
2. Department of Engineering “Enzo Ferrari”, Università di Modena e Reggio Emilia, Strada Vignolese 905/A, I-41125, Modena, Italy
3. Centre for Mathematical Sciences, Universiti Sains Malaysia, 11800 Gelugor, Penang, Malaysia
4. Faculty of Science and Natural Resources, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia
5. Education Department, Vaal University of Technology, Andries Potgieter Blvd, Vanderbijlpark, 1911, South Africa