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By: Ramírez Restrepo, John Jairo - Bicudo, Carlos E. (Carlos Eduardo)Type: ArticleIn: Instituto Internacional de EcologiaVolume:Series:Issue:Date: 2005-02-01Page Range:Publication Info: Instituto Internacional de Ecologia 2005-02-01Subjects: Brazil nitrogen and phosphorus inorganic forms phytoplankton ecology soluble reactive silica tropical shallow urban reservoir