1. Faculty of Chemical and Process Engineering Technology, Universiti Malaysia Pahang, 26300 Gambang, Kuantan, Pahang Darul Makmur Malaysia
2. PETRONAS Research Sdn. Bhd., Lot 3288 and 3289, Off Jalan Ayer Itam, Kawasan Institusi Bangi, 43000 Kajang, Selangor Darul Ehsan Malaysia