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WikiPedia: Rái cá cổ đốm http://www.google.com/books?id=JgAMbNSt8ikC&pg=PA5... http://www.departments.bucknell.edu/biology/resour... http://www.itis.usda.gov/servlet/SingleRpt/SingleR... //doi.org/10.2305%2FIUCN.UK.2021-3.RLTS.T12420A164... http://www.otterspecialistgroup.org/Species/Lutra_... //www.worldcat.org/oclc/62265494 https://web.archive.org/web/20041119182644/http://... https://www.iucnredlist.org/species/12420/16457899...