Urrutia, C Two step esterification-transesterification process of wet greasy sewage sludge for biodiesel production. [electronic resource] - Bioresource technology Jan 2016 - 1044-9 p. digital Publication Type: Journal Article; Research Support, Non-U.S. Gov't ISSN: 1873-2976 Standard No.: 10.1016/j.biortech.2015.10.039 doi Subjects--Topical Terms: BiofuelsCatalysisEsterificationEsters--chemistryFatty Acids, Nonesterified--chemistrySewage--chemistryTriglycerides--chemistryWaste Disposal, Fluid--methods