Vargáné Visi, Éva, and János Csapó. “Changes in the Free D-Aspartic Acid D-Glutamic Acid and D-Alanine Content of Cheddar During Cheesemaking Process”. Acta Agraria Kaposváriensis, vol. 7, no. 1, Feb. 2003, pp. 47-61, https://journal.uni-mate.hu/index.php/aak/article/view/1641.