Analysis of information sources in references of the Wikipedia article "艾伦·图灵" in Chinese language version.
In late 1940 Alan Turing wrote a report describing the methods he and his colleagues at Bletchley Park had used to break into the German Enigma cipher systems. At Bletchley it was known as 'the Prof's Book.' A copy of this handbook was at last released from secrecy by the American National Security Agency in April 1996, under the title Turing's Treatise on the Enigma. Subsequently, a much better original copy was released by the (British) National Archives, box HW 25/3. This also revealed a title which had been lost in the American copy: Mathematical theory of ENIGMA machine. (Though, oddly, the report does not actually have any mathematical theory.)
Update 13 February 2015
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的值 (帮助). doi:10.1112/PLMS/S2-42.1.230. Wikidata Q25864184 (英语). (erratum)Update 13 February 2015
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的值 (帮助). doi:10.1112/PLMS/S2-42.1.230. Wikidata Q25864184 (英语). (erratum)Update 13 February 2015
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的值 (帮助). doi:10.1112/PLMS/S2-42.1.230. Wikidata Q25864184 (英语). (erratum)Update 13 February 2015
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的值 (帮助). doi:10.1112/PLMS/S2-42.1.230. Wikidata Q25864184 (英语). (erratum)|zbl=
的值 (帮助). doi:10.1112/PLMS/S2-42.1.230. Wikidata Q25864184 (英语). (erratum)