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Nuclear weapons:
* _. }' i! [7 k# u8 ?* [http://nuclearweaponarchive.org/Nwfaq/Nfaq0.html
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5 Z8 L  q* Y9 Z- W7 J0 Q+ }Weapons 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>


$ E8 T  ~6 t- n% jNuclear 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:
2 i, m. u/ p. K* `<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:
<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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4 }8 B; X, b& bLerner, 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>

3 |- i2 I& }( u. U: B7 C0 bcritical mass
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& p/ \" D! U2 @3 W. v  K7 y9 x1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
% R, m$ {+ e; q& b/ b8 B2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe
* n; ]% @+ I. K+ f* o  l<http://www.thefreedictionary.com/critical+mass>

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