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Nuclear weapons:
http://nuclearweaponarchive.org/Nwfaq/Nfaq0.html

) n/ y  [8 L  _4 [  ~7 c! n+ pWeapons of Mass Destruction. (2003). In Harvey Kushner (Ed.), Encyclopedia of Terrorism, Vol. 1. (404-406). Thousand Oaks: Sage Reference. Retrieved October 22, 2008,  from Gale Virtual Reference Library via Gale:
<http://find.galegroup.com/gvrl/i ... 925&version=1.0>


6 N8 ]9 j# M, ^' E4 LNuclear Weapons. (2006). Encyclopedia of Modern Europe: Europe Since 1914: Encyclopedia of the Age of War and Reconstruction, Vol. 4. (1891-1898). Retrieved October 22, 2008,  from Gale Virtual Reference Library via Gale:
( N/ D& @4 u' C* ~6 W<http://find.galegroup.com/gvrl/i ... 925&version=1.0>


Clark, Roger. (2005). Nuclear Weapons. In Dinah Shelton (Ed.), Encyclopedia of Genocide and Crimes Against Humanity, Vol. 2. (754-761). Detroit: Macmillan Reference USA. Retrieved October 22, 2008,  from Gale Virtual Reference Library via Gale:
' G4 h$ ~: a! Z* s9 |6 H<http://find.galegroup.com/gvrl/i ... 925&version=1.0>

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Lerner, K. Lee, Gilman, Larry, & Haycock, Dean Allen. (2004). Nuclear Weapons. In K. Lee Lerner & Brenda Lerner (Eds.), Gale Encyclopedia of Science, Vol. 4. (3rd ed., 2816-2821). Detroit: Gale. Retrieved October 22, 2008,  from Gale Virtual Reference Library via Gale:
<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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, }& C6 J: ~) Z2 Ocritical mass
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$ X" I, }% ^3 F& B1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
! c$ H" D$ t  q, k( D! p; R# d& k2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe
9 g- [3 y0 m2 l8 O4 l, v<http://www.thefreedictionary.com/critical+mass>
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