Veien, NK, J Genner, H Brodthagen, and G. Wettermark. “Photodynamic Inactivation of Verrucae Vulgares. II”. Acta Dermato-Venereologica 57, no. 5 (September 1, 1977): 445–447. Accessed July 19, 2026. https://medicaljournalssweden.se/actadv/article/view/17427.