@article{1989,  volume={3},  ISSN={0102-3306},  url={https://doi.org/10.1590/S0102-33061989000200007},  DOI={10.1590/S0102-33061989000200007},  number={2},  journal={Acta Botanica Brasilica},  publisher={Sociedade Botânica do Brasil},  year={1989},  month={Dec},  pages={75–84} }