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| From a book https://books.google.sk/books?id=35ClAgAAQBAJ&pg=PA292#v=onepage&q&f=false |
Kahn, David(1998) 'SOVIET COMINT IN THE COLD WAR', Cryptologia, 22: 1, 1 — 24:
pondelok 7. novembra 2016
General KGB meets world's finest cryptologic historian
Kahn, David(1998) 'SOVIET COMINT IN THE COLD WAR', Cryptologia, 22: 1, 1 — 24:
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