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Nuclear weapons:
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5 R) j. f: s. F) @* I- v8 LWeapons 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>


4 w1 l: v" d) @! c- n+ a; [9 Z; rNuclear 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:
' j3 V+ t. D6 a  z5 y8 P$ A<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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4 O7 z2 j/ _% n& y0 K& ]7 F& [; `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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& F/ _) B1 v* ~critical mass
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1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
+ {1 \6 _/ |8 C2 w4 ^1 q; A2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe
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3 z' O" L1 e/ r. ^[ 本帖最后由 墨涟 于 2008-10-24 15:04 编辑 ]