@article{sobrinho_tabatinga_machado_lopes_2013,  title={Reproductive phenological pattern of Calotropis procera (Apocynaceae), an invasive species in Brazil: annual in native areas; continuous in invaded areas of caatinga},  volume={27},  ISSN={0102-3306},  url={https://doi.org/10.1590/S0102-33062013000200018},  DOI={10.1590/S0102-33062013000200018},  number={2},  journal={Acta Botanica Brasilica},  publisher={Sociedade Botânica do Brasil},  author={Sobrinho, Mellissa Sousa and Tabatinga, George Machado and Machado, Isabel Cristina and Lopes, Ariadna Valentina},  year={2013},  month={Apr},  pages={456–459} }