Silva, Marx Leandro Naves, et al. “Rainfall Erosivity Indices in the Goiânia Region, Goiás State, Brazil”. Pesquisa Agropecuaria Brasileira, vol. 32, no. 10, Oct. 1997, pp. 977-85, doi:10.1590/S1678-3921.pab1997.v32.4743.