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---

@Book{GangOfFour,

author     = "Erich {Gamma} and Richard {Helm} and Ralph {Johnson} and John {Vlissides}",
ref-author = "Gamma, et al.",
title      = "Design Patterns: Elements of Reusable Object-Oriented Software",
publisher  = "Addison-Wesley",
year       = 1994,
address    = "Reading, Mass.",
pages      = 395,
isbn       = "0-201-63361-2",
url        = "http://en.wikipedia.org/wiki/Design_Patterns"

}