Albert, Csilla, et al. “The Effect of Microorganisms of Raw Milk on Free Amino Acid and Free D-Amino Acid Contents of Milk and Dairy Products”. Acta Agraria Kaposváriensis, vol. 11, no. 3, Oct. 2007, pp. 1-13, https://journal.uni-mate.hu/index.php/aak/article/view/1892.