@article{lima_silva_moreira_passos_coelho_elesbon_2019,  title={Development of an annual drought classification system based on drought severity indexes},  volume={91},  ISSN={0001-3765},  url={https://doi.org/10.1590/0001-3765201920180188},  DOI={10.1590/0001-3765201920180188},  number={1},  journal={Anais da Academia Brasileira de Ciências},  publisher={Academia Brasileira de Ciências},  author={LIMA, RAFAEL P.C. and SILVA, DEMETRIUS D. DA and MOREIRA, MICHEL C. and PASSOS, JÉSSICA B.M.C. and COELHO, CLÍVIA D. and ELESBON, ABRAHÃO A.A.},  year={2019},  pages={e20180188} }