Khampa, S. “Effects of Supplementation of Yeast Malate Fermented Cassava Chip as a Replacement Concentrate on Rumen Fermentation Efficiency and Digestibility of Nutrients in Heifer”. Asian Health, Science and Technology Reports, vol. 17, no. 2, Aug. 2009, pp. 109-15, https://ph03.tci-thaijo.org/index.php/ahstr/article/view/2346.