Stephen B. Gilbert, Stephen Blessing, Sateesh Kodavali. The Extensible Problem-Specific Tutor (xPST): Evaluation of an API for Tutoring on Existing Interfaces. In Vania Dimitrova, Riichiro Mizoguchi, Benedict du Boulay, Arthur C. Graesser, editors, Artificial Intelligence in Education: Building Learning Systems that Care: From Knowledge Representation to Affective Modelling, Proceedings of the 14th International Conference on Artificial Intelligence in Education, AIED 2009, July 6-10, 2009, Brighton. Volume 200 of Frontiers in Artificial Intelligence and Applications, pages 707-709, IOS Press, 2009. [doi]
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