Tareen, A.K., Danbamrongtrakool, N. , Sultan, I.N. , Laemsak, N. , Sirisansaneeyakul, S. , Vanichsriratana, W. and Parakulsuksatid, P. 2021. Utilization of urea as a nitrogen source for ethanol production from oil palm trunk using simultaneous saccharification and fermentation. Agriculture and Natural Resources. 55, 3 (Jun. 2021), 448–455.