Tauber, Marie, et al. “Unresectable Perineal Cuniculatum Carcinoma: Partial Remission Using Systemic Isotretinoin and Interferon-α2a Therapy”. Acta Dermato-Venereologica, vol. 94, no. 6, Apr. 2014, pp. 721-2, doi:10.2340/00015555-1852.