R. Marques da Silva, C. Santos and L. Pereira e Silva, “Evaluation of soil loss in guaraíra basin by gis and remote sensing based model”, Jou. of Urb. and Env. Eng., vol. 1, no. 2, pp. 44-52, ago. 2007. doi: http://doi.org/10.4090/juee.2007.v1n2.044052