Tenke, János, et al. “The Effect of Dietary Lysine Level on the Ileal Digestibility of Protein and Amino Acids in Growing Pigs”. Acta Agraria Kaposváriensis, vol. 15, no. 2, Feb. 2011, pp. 47-54, https://journal.uni-mate.hu/index.php/aak/article/view/2039.