Mallika Tapanwong, and Vittaya Punsuvon. “PRODUCTION OF ETHYL ESTER BIODIESEL FROM USED COOKING OIL WITH ETHANOL AND ITS QUICK GLYCEROL-BIODIESEL LAYER SEPARATION USING PURE GLYCEROL”. GEOMATE Journal, vol. 17, no. 61, Feb. 2019, pp. 109-14, https://geomatejournal.com/geomate/article/view/2142.