| References |
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| • | Design
Patterns: Elements of Reusable Object-Oriented Software, |
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| Gamma, Helm,
Johnson, Vlissides, Addison Wesley, 1995, pp 207- |
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| 217 |
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| • | http://www.eli.sdsu.edu/courses/spring98/cs635/index.html |
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| • | http://st-www.cs.uiuc.edu/cgi-bin/wikic/wikic |
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| • | http://www.tcm.hut.fi/~pnr/GoF-models/html/ |
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