@article{1997,  title={Universidade Federal do Pernambuco},  volume={11},  ISSN={0102-3306},  url={https://doi.org/10.1590/S0102-33061997000200025},  DOI={10.1590/S0102-33061997000200025},  number={2},  journal={Acta Botanica Brasilica},  publisher={Sociedade Botânica do Brasil},  year={1997},  month={Dec},  pages={300–307} }