1. Department of Mathematics, Faculty of Science and Technology, University Malaysia Terengganu, 21030 Kuala Terengganu, Terengganu, Malaysia
2. Department of Physics, College of Science, Anbar University, 21030 Kuala Terengganu, Anbar, Iraq
3. Faculty of Computer and Mathematical Sciences, Universiti Teknologi MARA (Segamat Campus), Johor, Anbar, Malaysia