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Nuclear weapons:
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$ V( _8 h' ?# ?: o% ?" ]3 ]; V( U" mWeapons 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:
- u# r" u8 `& A& F<http://find.galegroup.com/gvrl/i ... 925&version=1.0>


* j4 ?7 m& @; J, ]$ u5 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:
<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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' E. X! E6 q$ K: d+ o+ 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:
<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:
" M* B) n3 A+ _<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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& h6 _; o/ q( q1 `critical mass
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6 e) x& G, A. ]1 Q7 p1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
/ Z1 H( h7 V% i1 ]- V2. 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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