Baptista, A. Poiares. “ROBERT WILLAN AND PAUL LANGERHANS – Two Personalities of the History of Medicine and Dermatology and the Madeira Island (About an Ephemerid)”. Journal of the Portuguese Society of Dermatology and Venereology 70, no. 1 (January 20, 2013): 25. Accessed July 5, 2024. https://revista.spdv.com.pt/index.php/spdv/article/view/34.