Savitree Limtong, and Touchaporn Rupasut. “Increasing the Glucoamylase Producing capacity at High Temperature of Yeast by Mutation”. Agriculture and Natural Resources, vol. 24, no. 1, Mar. 1990, pp. 76-86, https://li01.tci-thaijo.org/index.php/anres/article/view/242103.