CULEA, Monica, et al. “GC-MS METHODS FOR AMINO ACIDS DETERMINATION IN DIFFERENT BIOLOGICAL EXTRACTS”. Studia Universitatis Babeș-Bolyai Chemia, vol. 61, no. 1, Mar. 2016, pp. 213-22, https://studia.reviste.ubbcluj.ro/index.php/chemia/article/view/8294.