@article{silva_azevedo_2020,  title={Temporal trend of drought and aridity indices in semi-arid pernambucano to determine susceptibility to desertification},  volume={25},  ISSN={2318-0331},  url={https://doi.org/10.1590/2318-0331.252020190145},  DOI={10.1590/2318-0331.252020190145},  journal={RBRH},  publisher={Associação Brasileira de Recursos Hídricos},  author={Silva, Fabianny Joanny Bezerra Cabral da and Azevedo, José Roberto Gonçalves de},  year={2020},  pages={e32} }