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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: ) ^4 c) ]4 H( P+ O% J/ e! {
<http://find.galegroup.com/gvrl/i ... 925&version=1.0>* k- H) _! ^- `, r; p+ _- x' R4 a2 M
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8 F; a8 t7 C/ H3 o9 E( ^: u% d2 \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: ! R% r& U) l$ m
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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:
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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:
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critical mass, y( g" R" u, K# L$ y7 Q
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$ P' w$ n3 ^- l# k; F0 w1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.8 h+ q6 e. _8 D6 b! T3 r
2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe7 p! |6 K9 L$ o# t6 C6 L
<http://www.thefreedictionary.com/critical+mass>
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