1. Universiti Sains Malaysia, School of Mathematical Sciences, USM, Gelugor, Penang, Malaysia + Preparatory Centre of Science and Technology, Universiti Malaysia Sabah, Jalan UMS, Kota Kinabalu, Sabah, Malaysia
2. Universiti Sains Malaysia, School of Mathematical Sciences, USM, Gelugor, Penang, Malaysia
3. Universiti Putra Malaysia, Institute for Mathematical Research, Serdang Selangor, Malaysia