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- Russian, French, Spanish and German (1st ed.). Elsevier. p. 557. ISBN 9780080488783. Retrieved 22 June 2015. Archinal, B. A.; A’Hearn, M. F.; Bowell, E...3 KB (335 words) - 18:46, 21 March 2023
- English, Russian, French, Spanish and German. Elsevier. p. 119. ISBN 9780080488783. "Circumpolar distribution". Oxford Reference. Oxford University Press...4 KB (283 words) - 02:58, 4 April 2023