@article{rocha_machado_2009,  title={Anatomy, ultrastructure and secretion of Hibiscus pernambucensis Arruda (Malvaceae) extrafloral nectary},  volume={32},  ISSN={0100-8404},  url={https://doi.org/10.1590/S0100-84042009000300008},  DOI={10.1590/S0100-84042009000300008},  number={3},  journal={Brazilian Journal of Botany},  publisher={Sociedade Botânica de São Paulo},  author={Rocha, Joecildo Francisco and Machado, Silvia Rodrigues},  year={2009},  month={Jul},  pages={489–498} }