Hansson, C, H Rorsman, and E Rosengren. 1981. “Pronounced Formation of 5-OH-Dopa at Enzymatic Oxidation of DOPA in the Presence of Ascorbic Acid”. Acta Dermato-Venereologica 61 (2):147-48. https://doi.org/10.2340/0001555561147148.