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Cheon, S. (2013). The Kim Jong-un Regime’s „Byungjin“ (Paralled Development) Policy of Economy and Nuclear Weapons and the ‘April 1st Nuclearization Law‘, Korean Institute for National Unification
 Nuclear spy ring consists of Julius and Ethel Rosenberg, Harry Gold, Klaus Fuchs, David and Ruth Greenglass
 Kim Plilby
 Dangle - A person sent by the intelligence agency of his or her own country who approaches an intelligence agency in the hope of being recruited as a spy so as to allow a double agent operation