Hansson, C. “6-Hydroxy-5-Methoxyindole-2-Carboxylic Acid in Normal Human Urine”. Acta Dermato-Venereologica 64, no. 3 (May 1, 1984): 185–190. Accessed July 11, 2024. https://medicaljournalssweden.se/actadv/article/view/6970.