D. I. S. Brites, E. A. Silva, L. C. de G. Goergen, M. M. da C. Nunes, and R. S. Pereira, “Temporal and spatial dynamics of the soil usage in the micro-region of Campanha Central do Rio Grande do Sul between the years of 1992 and 2010”, REGET, vol. 13, no. 13, pp. 2701–2709, Aug. 2013.