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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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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:
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) y0 R+ K: V9 o/ X; c8 R# F8 c/ HClark, 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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Lerner, 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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- O8 T  f3 T0 `$ ?9 o5 C" z: zcritical mass
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3 d3 X. p' g( n4 O) D4 V: E" I: m1. The smallest mass of a fissionable material that will sustain a nuclear chain reaction at a constant level.
2 T* L7 Z) A0 n) X, V# S) Y2. The amount of matter needed to generate sufficient gravitational force to halt the current expansion of the universe
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3 ]4 s7 i: ~# n1 L  q" R[ 本帖最后由 墨涟 于 2008-10-24 15:04 编辑 ]