Wei, Lim Mee, Lau Ee Von, and Poh Phaik Eong. 2015. “Optimization of Nanobubble-Assisted Bunker Oil Flotation from Oil-Wet Sand via Response Surface Methodology (RSM)”. ASEAN Journal of Chemical Engineering 15 (1), 1-9. https://dev.journal.ugm.ac.id/v3/AJChE/article/view/8855.