@article{gahona_machado filho_2012,  title={Spontaneous involution of keratoacanthoma, iconographic documentation and similarity with volcanoes of nature},  volume={87},  ISSN={0365-0596},  url={https://doi.org/10.1590/S0365-05962012000200031},  DOI={10.1590/S0365-05962012000200031},  number={2},  journal={Anais Brasileiros de Dermatologia},  publisher={Sociedade Brasileira de Dermatologia},  author={Gahona, Maria Leonor Enei and Machado Filho, Carlos d' Aparecida Santos},  year={2012},  month={Mar},  pages={335–336} }