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

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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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:
' s  u) C5 G, |; `<http://find.galegroup.com/gvrl/i ... 925&version=1.0>

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8 |9 z5 s7 z7 t% gClark, 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, _, C1 x3 G4 r# S  dLerner, 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>

! e0 B7 ]) d  H) |# c6 @1 jcritical mass
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# e5 h& k: k# W" L, [9 L/ m1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
3 c5 l6 f, D5 V2 k; o" P- q) V+ @: c2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe
) I( ]' C  M9 l/ D& J  o<http://www.thefreedictionary.com/critical+mass>

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