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WikiPedia: Cà_cưỡng http://www.birds.cornell.edu/clementschecklist/dow... http://datazone.birdlife.org/species/factsheet/227... http://www.boldsystems.org/index.php/TaxBrowser_Ta... //doi.org/10.1016%2Fj.ympev.2008.01.020 //doi.org/10.1111%2Fj.1463-6409.2008.00339.x http://www.tierstimmen.org/en/database?field_spec_... http://www.nrm.se/download/18.251938811dab4a5dcc80... https://s3.amazonaws.com/academia.edu.documents/25... https://books.google.com/books?id=DgZCBAAAQBAJ&pg=... https://books.google.com/books?id=hpiuraQ-rfQC&pg=...