Assad, Eduardo Delgado, Edson Eyji Sano, Ryo Masutomo, Luis Hernan R. de Castro, and Fernando A. Macena da Silva. 1993. “Dry Spells in the Brazilian ‘cerrados’ Region: Frequency and Probability of Occurrence”. Pesquisa Agropecuaria Brasileira 28 (9):993-1003. https://doi.org/10.1590/S1678-3921.pab1993.v28.3962.