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Nuclear weapons:
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4 [( v* G- t5 b  [$ s" ~, QWeapons 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>

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6 A6 Y( k! N! f# T' SNuclear 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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9 `& [7 j/ u) z$ h, Q$ AClark, 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:
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% T/ V2 g2 J6 p6 T1 R& }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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critical mass
n.
/ q1 q( D3 v' c5 q6 R1 @' B1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
* h. u0 J% @- I# E1 g2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe
5 `4 t; L4 G' y<http://www.thefreedictionary.com/critical+mass>
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