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==External links==
*[http://www.cs.oberlin.edu/~jwalker/nullObjPattern/
*[http://martinfowler.com/eaaCatalog/specialCase.html Martin Fowler's description of Special Case, a slightly more general pattern]
*[http://www.owlnet.rice.edu/~comp212/00-spring/handouts/week06/null_object_revisited.htm Null Object Pattern Revisited]
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