C. Davanço, R., D. J. Neto, C. B. Milanez, and A. J. Tebcheran. “Trichilemmal Horn: A Case Report”. Journal of the Portuguese Society of Dermatology and Venereology, Vol. 79, no. 4, Dec. 2021, pp. 365-7, doi:10.29021/spdv.79.4.1383.