Todd, D J, G S Nesbitt, T D Lavery, E R Trimble, and D Burrows. 1990. “Erythropoietic Protoporphyria. The Problem of a Suitable Screening Test”. Acta Dermato-Venereologica 70 (4):347-50. https://doi.org/10.2340/0001555570347350.