Design Principles of Mathpert: Software to support education in algebra and calculus. Beeson, M. In Computer-Human Interaction in Symbolic Computation, pages 89-115. Springer-Verlag, Berlin Heidelberg New York, 1998.  
Pdf  bibtex   @incollection{beeson1998a,
	address = {Berlin Heidelberg New York},
	author = {Michael Beeson},
	booktitle = {Computer-Human Interaction in Symbolic Computation},
	date-added = {2014-11-13 23:48:07 +0000},
	date-modified = {2018-01-29 08:35:21 +0000},
	editor = {Norman Kajler},
	keywords = {MathXpert, Education},
	pages = {89-115},
	publisher = {Springer-Verlag},
	title = {Design Principles of {M}athpert: Software to support education in algebra and calculus},
	url_pdf = {hisc.pdf},
	year = {1998}} 
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