@article{ferreira_lopes_trovão_2016,  title={Patterns of species richness and abundance among cactus communities receiving different rainfall levels in the semiarid region of Brazil},  volume={30},  ISSN={0102-3306},  url={https://doi.org/10.1590/0102-33062016abb0084},  DOI={10.1590/0102-33062016abb0084},  number={4},  journal={Acta Botanica Brasilica},  publisher={Sociedade Botânica do Brasil},  author={Ferreira, Paulo Sérgio Monteiro and Lopes, Sérgio de Faria and Trovão, Dilma Maria de Brito Melo},  year={2016},  month={Oct},  pages={569–576} }