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"Spanish Enigma: A History of the Enigma in Spain."
José Ramón Soler Fuensanta, Francisco Javier López-Brea Espiau, Frode Weierud (2010)
- José Ramón Soler Fuensanta, Francisco Javier López-Brea Espiau, Frode Weierud:
Spanish Enigma: A History of the Enigma in Spain. Cryptologia 34(4): 301-328 (2010)
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