1. Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides. Design Patterns -- Elements of Reusable Object-Oriented Software. Addison-Wesley, 1^st edition, 1994.

1. Don Roberts, John Brant, and Ralph Johnson. A Refactoring Tool for Smalltalk, 1999.



2. Ralph Johnson. Classic Smalltalk Bugs, 1997. [WWW ]

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