D. S. Fernandes, A. B. Heinemann, R. L. F. Paz, and A. de O. Amorim, “Performance of quantitative drought indices in the upland rice yield estimates”, PAB, vol. 45, no. 8, pp. 771–779, Jan. 2011, doi: 10.1590/S1678-3921.pab2010.v45.8239.