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Nuclear weapons:
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' D! R8 ^% x9 M, T. h: I( cWeapons 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: ' o) h" h/ I2 w# t6 z
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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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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:
: l& x1 K7 w3 ?, r4 J1 q<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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1 y/ [0 {+ W, A- H8 D( e: G( t5 lLerner, 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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N4 A5 v; W% icritical mass# j( K3 Q/ F( E' C# i( Q0 E
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- d1 ^# G' [3 p. @1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.& w/ N. j9 u0 u. C
2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe
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