J. Csanádi, J. Csapó, J. Fenyvessy, A. Jávor, and O. Bara-Herczegh, “The free D-Aspartic acid and D-Glumatic acid content of sheep milk and sheep milk products”, Anal. Tech. Szeged., vol. 8, no. 2, pp. 101–105, May 2014.