1. Department of Mathematics & Statistics, Faculty of Science, Universiti Putra Malaysia, UPM Serdang, Selangor, Malaysia + School of Information & Physical Sciences, The University of Newcastle, University Drive, Callaghan, NSW, Australia
2. Department of Mathematics & Statistics, Faculty of Science, Universiti Putra Malaysia, UPM Serdang, Selangor, Malaysia
3. Computational & Analytical Mathematics and Their Applications Research Group, Department of Mathematics, Faculty of Science, University of Tabuk, Tabuk, Saudi Arabia