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Baris 29: * {{citation \| last = Lewin \|first = Ronald \| author-link = Ronald Lewin \| title = Ultra goes to War \| origyear = 1978 \| year = 2001 \| edition = Penguin Classic Military History \| isbn = 978-0-14-139042-0 \| publisher = Penguin Group \| location = London }} Focuses on the battle-field exploitation of Ultra material. * {{citation \| last = Mallmann-Showell \| first = J.P. \| title = German Naval Code Breakers \| publisher = Ian Allan Publishing \| year = 2003 \| isbn = 0-7110-2888-5 \| location = Hersham, Surrey \| oclc=181448256 }} * {{citation \| last = Momsen \| first = Bill \| url = http://home.earthlink.net/~nbrass1/4enigma.htm \| title = Codebreaking and Secret Weapons in World War II: Chapter IV 1941–42 \| publisher = Nautical Brass \| year = 2007 \| origyear = 1977 \| accessdate = 2008-02-18 \| archive-date = 2001-01-26 \| archive-url = https://web.archive.org/web/20010126131700/http://home.earthlink.net/~nbrass1/4enigma.htm \| dead-url = yes }} * {{citation \| last = Pidgeon \| first = Geoffrey \| title = The Secret Wireless War: The Story of MI6 Communications 1939–1945 \| publisher = UPSO Ltd \|location=St Leonards-on-Sea, East Sussex \| year = 2003 \| isbn = 1-84375-252-2 \| oclc = 56715513 }} * [[Marian Rejewski\|Rejewski, Marian]], wrote a number of papers on his 1932 break into Enigma and his subsequent work on the cipher, well into World War II, with his fellow mathematician-cryptologists, [[Jerzy Różycki]] and [[Henryk Zygalski]]. Most of Rejewski's papers appear in {{Harvnb\|Kozaczuk\|1984}}

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