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Nuclear weapons:
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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: 2 c; W4 h- G0 ^6 R8 P
<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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Nuclear 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:
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2 s2 a5 k4 G4 l$ j3 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:
3 }8 m5 R) W+ a% e* ~) w! }. V<http://find.galegroup.com/gvrl/i ... 925&version=1.0>+ h* @# g' H9 m* [2 f# d V
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/ c8 L6 l- z9 d% |. n; uLerner, 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:
3 D: v+ i5 ]+ j8 M<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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4 r/ M) H2 c* w9 r. pcritical mass$ b+ a" E) ^( x6 Z% P9 P
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/ e& f0 n- g! s3 D1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.5 Y7 [9 s# J$ c5 {
2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe# A% l" e% v6 ~0 P5 k1 d6 i
<http://www.thefreedictionary.com/critical+mass>
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