@article{silveira júnior_saba_jardim_2012,  title={Pollen morphology of Rubiaceae Juss. species occurring in an area of caatinga (dryland) vegetation in Bahia State, Brazil},  volume={26},  ISSN={0102-3306},  url={https://doi.org/10.1590/S0102-33062012000200020},  DOI={10.1590/S0102-33062012000200020},  number={2},  journal={Acta Botanica Brasilica},  publisher={Sociedade Botânica do Brasil},  author={Silveira Júnior, Cristiano Eduardo Amaral and Saba, Marileide Dias and Jardim, Jomar Gomes},  year={2012},  month={Apr},  pages={444–455} }