Khampa, S., Chaowarat, P., Koatdoke, U., Singhalert, R., & Wanapat, M. (2009). Manipulation of Rumen Ecology by Malate and Yeast in Native Cattle. Pakistan Journal of Nutrition, 8(7), 1048–1051. https://doi.org/10.3923/pjn.2009.1048.1051