Pavel S, Elzinga H, Muskiet F, Wolthers B. Identification of 5,6-dimethoxyindolyl-2-carboxylic acid in melanotic urine. Acta Derm Venereol [Internet]. 1983 Jul. 1 [cited 2026 May 25];63(4):340-3. Available from: https://medicaljournalssweden.se/actadv/article/view/7899