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Burns, John J.; Fay, Francis H. (6. 5. 2010). „Comparative morphology of the skull of the Ribbon seal, Histriophoca fasciata, with remarks on systematics of Phocidae”. Journal of Zoology. 161 (3): 363—394. ISSN0952-8369. doi:10.1111/j.1469-7998.1970.tb04519.x.