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http://dx.doi.org/10.1007/s10639-008-9062-z
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Evaluating a web based intelligent tutoring system for mathematics at German lower secondary schools
- Martin Graff, Peter Mayer, Morena Lebens
- Education and Information Technologies, July 2008, Springer Science + Business Media
- DOI: 10.1007/s10639-008-9062-z
