Costa, Rubens Germano, and Hans Raj Gheyi. “Variation of Irrigation Water Quality in Microregion Catolé Do Rocha, PB, Brazil”. Pesquisa Agropecuaria Brasileira, vol. 19, no. 8, Apr. 2014, pp. 1021-5, doi:10.1590/S1678-3921.pab1984.v19.16016.