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Frank, Martin R., Graaff, J. J., Gieskens, Daniel F. and Foley, James D. (1992): Building User Interfaces Interactively Using Pre- and Postconditions. In: Bauersfeld, Penny, Bennett, John and Lynch, Gene (eds.) Proceedings of the ACM CHI 92 Human Factors in Computing Systems Conference June 3-7, 1992, Monterey, California. pp. 641-642. Available online
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