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Nuclear weapons:
http://nuclearweaponarchive.org/Nwfaq/Nfaq0.html

0 y; C; C- k! i2 rWeapons 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:
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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:
<http://find.galegroup.com/gvrl/i ... 925&version=1.0>


0 e! v( R: c! F% r# y: fClark, 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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* U. ?3 h: t& j9 mLerner, 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>

( T# V# Q+ V. x5 W! J+ y/ A4 ecritical mass
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7 x3 g$ C8 O4 D+ f# U1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
: T6 Q+ [# ?$ w. H7 m! z2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe
8 c4 i& ]+ t4 D, u1 i/ t<http://www.thefreedictionary.com/critical+mass>
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