Pilajun, Ruangyote, and Metha Wanapat. “Effect of Roughage to Concentrate Ratio and Plant Oil Supplementation on In Vitro Fermentation End-Products”. Pakistan Journal of Nutrition, vol. 13, no. 9, Aug. 2014, pp. 492–499, https://doi.org/10.3923/pjn.2014.492.499.