Polish Enigma double (English Wikipedia)

Analysis of information sources in references of the Wikipedia article "Polish Enigma double" in English language version.

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5worldcat.org

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2books.google.com

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1fgcu.edu

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1doi.org

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1semanticscholar.org

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1polandinexile.com

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books.google.com

Sebag-Montefiore, Hugh (2000), Enigma: The Battle for the Code, John Wiley, p. 21, ISBN 0-471-40738-0, On the last Saturday in January 1929 an alert customs officer working in Warsaw had been about to process a heavy box when his suspicions were aroused by a request from the German Embassy. Apparently the box had been sent to Poland by mistake and a German Embassy official was requesting that it should be returned to Germany immediately. When the box was opened, an Enigma machine was found inside. The Polish General Staff's Cipher Bureau quickly called in two engineers to examine it.. This date is one year later than Rejewski's date. This reference also has the Polish Cipher Bureau receiving technical details of the Enigma from the French in December 1931 and September 1932.
Gordon, Don E. (1981), Electronic Warfare: Element of Strategy and Multiplier of Combat Power, Pergamon, p. 36, ISBN 978-1483208824

doi.org

Rejewski, Marian (July 1981), "How Polish Mathematicians Deciphered the Enigma" (PDF), IEEE Annals of the History of Computing, 3 (3), IEEE: 213–234, doi:10.1109/mahc.1981.10033, S2CID 15748167, p. 213. says incident was end of 1927 or beginning of 1928. Enigma traffic appeared 15 July 1928.

fgcu.edu

chc60.fgcu.edu

Rejewski, Marian (July 1981), "How Polish Mathematicians Deciphered the Enigma" (PDF), IEEE Annals of the History of Computing, 3 (3), IEEE: 213–234, doi:10.1109/mahc.1981.10033, S2CID 15748167, p. 213. says incident was end of 1927 or beginning of 1928. Enigma traffic appeared 15 July 1928.

polandinexile.com

Enigma, http://www.polandinexile.com/enigmaenglish.html

semanticscholar.org

api.semanticscholar.org

Rejewski, Marian (July 1981), "How Polish Mathematicians Deciphered the Enigma" (PDF), IEEE Annals of the History of Computing, 3 (3), IEEE: 213–234, doi:10.1109/mahc.1981.10033, S2CID 15748167, p. 213. says incident was end of 1927 or beginning of 1928. Enigma traffic appeared 15 July 1928.

worldcat.org

search.worldcat.org

Kozaczuk 1984 Kozaczuk, Władysław (1984). Enigma: How the German Machine Cipher Was Broken, and How It Was Read by the Allies in World War Two. Foreign intelligence book series. edited and translated by Christopher Kasparek. Frederick, Maryland: University Publications of America. ISBN 0-89093-547-5. OCLC 9826775.
Kozaczuk 1984, p. 25 Kozaczuk, Władysław (1984). Enigma: How the German Machine Cipher Was Broken, and How It Was Read by the Allies in World War Two. Foreign intelligence book series. edited and translated by Christopher Kasparek. Frederick, Maryland: University Publications of America. ISBN 0-89093-547-5. OCLC 9826775.
Kozaczuk 1984, pp. 59–60 Kozaczuk, Władysław (1984). Enigma: How the German Machine Cipher Was Broken, and How It Was Read by the Allies in World War Two. Foreign intelligence book series. edited and translated by Christopher Kasparek. Frederick, Maryland: University Publications of America. ISBN 0-89093-547-5. OCLC 9826775.
Kozaczuk 1984, p. 83 Kozaczuk, Władysław (1984). Enigma: How the German Machine Cipher Was Broken, and How It Was Read by the Allies in World War Two. Foreign intelligence book series. edited and translated by Christopher Kasparek. Frederick, Maryland: University Publications of America. ISBN 0-89093-547-5. OCLC 9826775.
Kozaczuk 1984, pp. 84–85 Kozaczuk, Władysław (1984). Enigma: How the German Machine Cipher Was Broken, and How It Was Read by the Allies in World War Two. Foreign intelligence book series. edited and translated by Christopher Kasparek. Frederick, Maryland: University Publications of America. ISBN 0-89093-547-5. OCLC 9826775.