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Nuclear weapons:
" T$ Q" s+ @" j& a- |http://nuclearweaponarchive.org/Nwfaq/Nfaq0.html

8 a4 o- _8 e1 D( _4 [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:
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6 F3 M4 P9 G0 l2 XNuclear 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:
" O4 x" K& v+ T* J6 f, p2 q' c<http://find.galegroup.com/gvrl/i ... 925&version=1.0>

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6 m5 I7 v/ _! w) z7 |( u9 yClark, 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:
% a2 h4 A0 K: y( b1 o9 e<http://find.galegroup.com/gvrl/i ... 925&version=1.0>

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' W* t+ S5 s. D) G5 |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>

critical mass
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: Z3 o. Z& S1 z6 Q1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe
<http://www.thefreedictionary.com/critical+mass>
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