Agrup, G., Falck, B., Fyge, K., Rorsman, H., Rosengren, A., & Rosengren, E. (1975). Excretion of 5-S-cysteinyldopa in the urine of healthy subjects. Acta Dermato-Venereologica, 55(1), 7–9. https://doi.org/10.2340/00015555579