Begoña Vieites, José M. Suárez-Peñaranda, Victor Delgado, Hugo Vázquez-Veiga, Juan Varela, and Jerónimo Forteza. 2008. “Merkel Cell Carcinoma Associated With In Situ and Invasive Squamous Cell Carcinoma”. Acta Dermato-Venereologica 89 (2):184-86. https://doi.org/10.2340/00015555-0563.