DA FONSECA, A.F.; HERPIN, Uwe ; Paula, Alessandra Monteiro de ; Victória, Reynaldo Luiz ; MELFI, Adolpho José . Agricultural use of treated sewage effluents: agronomic and environmental implications and perspectives for Brazil. Scientia Agricola (USP. Impresso), v. 64, p. 194-209, 2007.