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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:
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" o7 }" g, `* C1 U7 f$ S! |6 v, ONuclear 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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! m5 g. P7 T7 O  k! o; 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:
<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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/ `) e" M6 t9 t' L/ \; N( rLerner, 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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5 u, I$ Y# H/ V+ Xcritical mass
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& @1 T2 i" B% f0 J! C) r1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
! ^- l4 x+ T2 G$ @- C7 z) Z; a2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe
<http://www.thefreedictionary.com/critical+mass>
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