Shi, Y. -F., et al. “Effect of a Porcine Liver Peptide Extract on TGF-β Induced Activation of Hepatic Stellate Cells”. Progress in Nutrition, vol. 12, no. 1, May 2010, pp. 37-45, https://mattioli1885journals.com/index.php/progressinnutrition/article/view/1009.