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↑ "2001 Categories & Criteria (version 3.1)" (PDF) . The IUCN Red List of Threatened Species . Archived from the original (PDF) on 2016-01-28 . Retrieved 2015-05-22 .

[1] "2001 Categories & Criteria (version 3.1)" (PDF) . The IUCN Red List of Threatened Species . Archived from the original (PDF) on 2016-01-28 . Retrieved 2015-05-22 .

[1]