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http://www.refactoring.com/
http://www.wikipedia.org/wiki/Refactor
http://ootips.org/refactoring.html
http://www.exciton.cs.rice.edu/comp410/books/refactoring.html
http://emw.inf.tu-dresden.de/de/pdai/Forschung/refactoring/refactoring_html/node26.html