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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:
<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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) S9 w! B+ V- KNuclear 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:
. p. H: u: N/ |/ x/ i5 y<http://find.galegroup.com/gvrl/i ... 925&version=1.0>

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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:
# ?0 E+ I: V! s' e5 j  T% R) H<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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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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$ ?! [& B; v* Z9 N! e% Y* r! Icritical mass
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1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
4 w% F" Z% f2 _; n6 u# ?2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe
) I' q5 o7 g% ^<http://www.thefreedictionary.com/critical+mass>
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7 r: M+ j7 k# r# @+ P, u* W# Y[ 本帖最后由 墨涟 于 2008-10-24 15:04 编辑 ]