@article{prowazek_aragão_1909,  title={Estudos sobre a Variola},  volume={1},  ISSN={0074-0276},  url={https://doi.org/10.1590/S0074-02761909000200007},  DOI={10.1590/S0074-02761909000200007},  number={2},  journal={Memórias do Instituto Oswaldo Cruz},  publisher={Instituto Oswaldo Cruz, Ministério da Saúde},  author={Prowazek, S. von and Aragão, H. de Beaurepaire},  year={1909},  month={Aug},  pages={147–158} }