Ribeiro, A. A., M. Simeão, and A. R. B. Santos. “WATER CLIMATOLOGICAL BALANCE FOR MUNICIPALITIES OF PIRIPIRI AND SAO JOAO DO PIAUÍ, PIAUÍ, BRAZIL”. Brazilian Journal of Biosystems Engineering, vol. 9, no. 3, Sept. 2015, pp. 228-35, doi:10.18011/bioeng2015v9n3p228-235.