Kanto Uthai, Sukanya Jattupornpong, Walter Vandepitte, and Erik Vanderbeke. “Effects of Dietary Supplementation of Enzymes in Soybean Meal Rich Diet on Performance of Growing-Finishing (20-100 kg) Pigs”. Agriculture and Natural Resources, vol. 38, no. 6, Dec. 2004, pp. 125-31, https://li01.tci-thaijo.org/index.php/anres/article/view/243223.