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

; D; x$ R9 e. d- n( FWeapons 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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8 K" f+ \, ?: X! ~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>
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7 o* M  j8 G7 h# W# w  ^* w& eClark, 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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! a+ d! v4 `$ b" D2 ~( QLerner, 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>

/ k7 ^# p3 x0 mcritical mass
n.
1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
# w3 U0 e' {( F" Z$ e7 g* b2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe
; J' x: p$ p1 |8 o2 c% b<http://www.thefreedictionary.com/critical+mass>
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