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<h2 id="references">References</h2> <ol> <li id="fn:1"><p>Polmar, Norman; Thomas B. Allen (October 1996). Spy Book, The Encyclopedia of Espionage. Random House. ISBN 978-0-679-42514-4. <a href="978-0-679-42514-4" target="_blank">978-0-679-42514-4</a> <a href="#fnref:1" class="footnote-back-ref">↩</a></p></li> </ol>