Ramalho, J.F.G.P., Sobrinho, N.M.B. do A. and Velloso, A.C.X. (2000) “Heavy metals contamination of a watershed in Caetés by the use of agrochemicals”, Pesquisa Agropecuaria Brasileira, 35(7), pp. 1289–1303. doi:10.1590/S1678-3921.pab2000.v35.5917.