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Frameworks. Diss. University of Illinois at Urbana-Champaign, 1992.
* Fowler, M., Beck, K., Brant, J., Opdyke, W., & Roberts, D. (1999). Refactoring: Improving the Design of Existing Programs.
* Opdyke, William F., and Ralph E. Johnson. "Creating abstract superclasses by refactoring." Proceedings of the 1993 ACM conference on Computer science. ACM, 1993.
* Johnson, Ralph E., and William F. Opdyke. "Refactoring and aggregation." Object Technologies for Advanced Software. Springer Berlin Heidelberg, 1993. 264-278.
* Foote, Brian,

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