A. S. Babji, N. A. Daud, and S. G. Husain, “Effect of Molecular Weight Reduction of Polypeptides on Angiotensin Converting Enzyme (ACE) Inhibitory Activity in Chicken Skin Hydrolysate (Collagen)”, J. Nutr. Ther., vol. 3, no. 2, pp. 81–86, Jun. 2014.