Di Pace, Bruno, et al. “A Rare Case of Squamous Cell Carcinoma of a Proliferating Trichilemmal Tumour”. Annali Italiani Di Chirurgia, vol. 88, no. 3, May 2017, pp. 263-7, https://annaliitalianidichirurgia.it/index.php/aic/article/view/1355.