Pereira, O. C. N., A. Bertonha, P. S. L. de Freitas, e C. Silvano. “<B>Development and Calibration of an Electrolytic Cell for Ion Determination in a Soil Solution”. Acta Scientiarum. Technology, vol. 37, nº 2, maio de 2015, p. 189-92, doi:10.4025/actascitechnol.v37i2.19634.