Epilithic Diatoms as Indicators of Water Quality in the Gravataí River, Rio Grande do Sul, Brazil.Published in:Hydrobiologia, 2006, v. 559, n. 1, p. 233, doi. 10.1007/s10750-005-9012-3By:Salomoni, S.;Rocha, O.;Callegaro, V.;Lobo, E.Publication type:Article