1. School of Mathematical Sciences, Sunway University, Petaling Jaya, Malaysia
2. Institute of Mathematical Sciences, Faculty of Science, Universiti Malaya, Kuala Lumpur, Malaysia
3. School of Mathematical Sciences, Universiti Sains Malaysia, Minden, Malaysia
4. Department of Physical and Mathematical Science, Faculty of Science, Universiti Tunku Abdul Rahman – Kampus Perak, Kampar, Malaysia
5. Lee Kong Chian Faculty of Engineering and Science, Universiti Tunku Abdul Rahman – Kampus Bandar Sungai Long, Kajang, Malaysia