«The NSA's Secret Spy Hub in Berlin,» Spiegel Online, October 27, 2013.
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Ian Traynor and Paul Lewis, «Merkel Compared NSA to Stasi in Heated Encounter with Obama,» Guardian, December 17, 2013.
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Duncan Campbell, Cahal Milmo, Kim Gengupta, Nigel Morris, and Tony Patterson, «Revealed: Britain's 'Secret Listening Post in the Heart of Berlin,'» Independent, November 5, 2013.