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WikiPedia: Vùng_GIUK http://www.computerharpoon.com/hce //doi.org/10.1080%2F03071847.2020.1769496 //www.worldcat.org/issn/0307-1847 http://www.mcga.gov.uk/c4mca/mcga07-home/emergency... https://thebarentsobserver.com/en/security/2019/10... https://www.thedrive.com/the-war-zone/30728/russia... https://podlodka.info/history/66-feat-submariners/... https://archive.org/details/stalkingredbeart0000sa... https://archive.org/details/stalkingredbeart0000sa... https://web.archive.org/web/20100831173118/http://...