1. Dept. of Mathematical Sciences, Faculty of ScienceUniv. Teknologi Malaysia Johor 81310 Skudai Malaysia
2. Centre for Sustainable Nanomaterials, Ibnu Sina Inst. for Scientific and Industrial ResearchUniv. Teknologi Malaysia Johor 81310 Skudai Malaysia
3. Faculty of Islamic CivilizationUniv. Teknologi Malaysia Johor 81310 Skudai Malaysia