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Weinand, Andre; Gamma, Erich; Marty, Rudolf (1988). ET++—an object oriented application framework in C++. OOPSLA (Object-Oriented Programming Systems, Languages and Applications). San Diego, California, United States. pp. 46–57. CiteSeerX10.1.1.471.8796. doi:10.1145/62083.62089. ISBN0-89791-284-5.