Silva, Fernanda Cristina de Souza, and José Paulo Molin. “On-the-Go Tropical Soil Sensing for PH Determination Using Ion-Selective Electrodes”. Pesquisa Agropecuaria Brasileira, vol. 53, no. 11, Dec. 2018, pp. 1189-02, doi:10.1590/S1678-3921.pab2018.v53.22930.