Alvarez-Quiñones, M, M F Garijo, F Fernández, and J F Val-Bernal. 1993. “Malignant Aneuploid Spindle Cell Transformation in a Proliferating Trichilemmal Tumour”. Acta Dermato-Venereologica 73 (6):444-46. https://doi.org/10.2340/0001555573444446.