de Carvalho, J.R.P. et al. 2002. Geostatistics to determine spatial variability of soil chemical properties using different preparation systems. Pesquisa Agropecuaria Brasileira. 37, 8 (Aug. 2002), 1151–1159. DOI:https://doi.org/10.1590/S1678-3921.pab2002.v37.6449.