@article{gomes_alves_2010,  title={Floristic diversity of two crystalline rocky outcrops in the Brazilian northeast semi-arid region},  volume={33},  ISSN={0100-8404},  url={https://doi.org/10.1590/S0100-84042010000400014},  DOI={10.1590/S0100-84042010000400014},  number={4},  journal={Brazilian Journal of Botany},  publisher={Sociedade Botânica de São Paulo},  author={Gomes, Polyhanna and Alves, Marccus},  year={2010},  month={Sep},  pages={661–676} }