Pias, O. H. de C., M. R. Cherubin, C. J. Basso, A. L. Santi, J. P. Molin, e C. Bayer. “<b&gt;Soil Penetration Resistance Mapping Quality: Effect of the Number of Subsamples”. Acta Scientiarum. Agronomy, Vol. 40, nº 1, fevereiro de 2018, p. e34989, doi:10.4025/actasciagron.v40i1.34989.