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

0 @. J% W0 M9 e$ s) C/ }" {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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9 B6 L/ u/ g! uNuclear 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:
3 |! C# i: J; r6 p7 k2 \9 Z<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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* `, f- V* N+ a2 K% XClark, 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:
2 D! T1 \1 h& c  D8 A<http://find.galegroup.com/gvrl/i ... 925&version=1.0>
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! T( L' r5 x! P& s  ELerner, 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>

9 N' P& \) g" @6 j% Y6 @1 gcritical mass
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1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
3 \! f5 Z" k! s1 H) e- R2. 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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