1. Deptartment of Science in Engineering, Faculty of Engineering, International Islamic University Malaysia, Jalan Gombak, 53100 Kuala Lumpur, Malaysia
2. School of Mathematical Sciences, Universiti Kebangsaan Malaysia, 43600 Bangi Selangor, Malaysia
3. Department of Mathematics, The University of Jordan, Amman 11942, Jordan
4. Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 Selangor, Malaysia