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http://sibgrapi.sid.inpe.br/col/dpi.inpe.br/vagner/1999/11.29.10.33/doc/001-70833333.pdf?metadatarepository=sid.inpe.br/banon/2001/03.30.15.58.41&mirror=sid.inpe.br/banon/2001/03.30.15.38.24&languagebutton=en