Bibliografia
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J.S. Brown at al.. 1982. Pedagogical, natural language, and knowledge engineeiring techniques in Sophie I, II, and III. In D. Sleeman and J.S. Brown (Eds.) Intelligent tutoring systems. Academic Press, London.
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Stefik, M. et al. 1983. Basic Concepts for Building Expert Systems. In F. Hayes-Roth et al. (eds.) Building Expert Systems. Addison Wesley, Reading, MA.