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James F. Allen Donna K. Byron Myroslava Dzikovska George Ferguson Lucian Galescu Amanda Stent Toward Conversational Human-Computer Interaction. 27-38 2001 22 AI Magazine 4 db/journals/aim/aim22.html#AllenBDFGS01 http://www.aaai.org/ojs/index.php/aimagazine/article/view/1590