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EothyrisTài liệu tham khảo
WikiPedia: Eothyris http://www.palaeos.com/Vertebrates/Units/Unit390/1... http://www.kheper.net/evolution/pelycosauria/Eothy... https://web.archive.org/web/20060503193950/http://... https://web.archive.org/web/20160304055435/http://...