Ngoc Luong, D., N. Huu Luong, and T. Binh Trong. “STUDIES ON THE ABILITY TO PRODUCE BIODIESEL OIL FROM WASTE SHORTENING OIL”. Science and Technology Development Journal, Vol. 11, no. 8, Aug. 2008, pp. 37-45, doi:https://doi.org/10.32508/stdj.v11i8.2672.