@article{1989,  volume={3},  ISSN={0102-3306},  url={https://doi.org/10.1590/S0102-33061989000100007},  DOI={10.1590/S0102-33061989000100007},  number={1},  journal={Acta Botanica Brasilica},  publisher={Sociedade Botânica do Brasil},  year={1989},  month={Jul},  pages={131–138} }