The user model in Mathpert, an expert system for learning mathematics. Beeson, M. In Bierman, Breuker, & Sandberg, editors, Artificial Intelligence and Education '89, pages 9-14, Amsterdam, 1989. IOS.
bibtex   
@inproceedings{beeson1989b,
	address = {Amsterdam},
	author = {Michael Beeson},
	booktitle = {Artificial Intelligence and Education '89},
	date-added = {2014-11-14 21:52:19 +0000},
	date-modified = {2014-11-14 21:53:46 +0000},
	editor = {Bierman and Breuker and Sandberg},
	keywords = {MathXpert, Education},
	pages = {9-14},
	publisher = {IOS},
	title = {The user model in {M}athpert, an expert system for learning mathematics},
	year = {1989}}

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