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WikiPedia: Cá_voi_Sei http://books.google.com/?id=30YZAAAAYAAJ&pg=PA234&... http://cetus.ucsd.edu/voicesinthesea_org/species/b... http://animaldiversity.ummz.umich.edu/site/account... http://www.nmfs.noaa.gov/pr/species/mammals/cetace... http://spo.nwr.noaa.gov/mfr611/mfr611.htm http://www.accobams.org/ http://www.acsonline.org/factpack/SeiBrydesWhales.... http://web.archive.org/web/www.edwardtbabinski.us/... http://www.arkive.org/species/GES/mammals/Balaenop... http://www.cresli.org/cresli/pdf%20documents/finwh...