Fristrup, Børge. “Ice Alias of the Northern Hemisphere. Hydrographie Office, Publication No. 550. Udgivet Af Hydrographie Office, United States Navy under the Authority of the Secretary of the Navy. Washington”. Geografisk Tidsskrift - Danish Journal of Geography 50 (January 1, 1950). Accessed September 27, 2024. https://tidsskrift.dk/geografisktidsskrift/article/view/48456.