Uthai Kanto, Sukanya Jattupornpong, Walter Vandepitte, and Erik Vanderbeke. 2004. “Effects of Dietary Supplementation of Enzymes in a Soybean Meal Rich Diet on the Performance of Weaned Pigs (4 – 8 weeks)”. Agriculture and Natural Resources 38 (6). Bangkok, Thailand:120-24. https://li01.tci-thaijo.org/index.php/anres/article/view/243222.