@article{freitas_1936,  title={Um methodo de coloração cytologica pela hemateina ferrea},  volume={31},  ISSN={0074-0276},  url={https://doi.org/10.1590/S0074-02761936000300003},  DOI={10.1590/S0074-02761936000300003},  number={3},  journal={Memórias do Instituto Oswaldo Cruz},  publisher={Instituto Oswaldo Cruz, Ministério da Saúde},  author={Freitas, Gilberto},  year={1936},  pages={707–717} }