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H. Luo, R. Shen, C. Niu, and C. Ullrich. Proceedings of the 14th International Conference on Artificial Intelligence and Statistics (AISTATS), 15, page 470--478. (2011)
X. Tan, C. Ullrich, and R. Shen. Intelligent and Adaptive Learning Systems: Technology Enhanced Support for Learners and Teachers, chapter 4, IGI Global, (2011)
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E. Melis, A. Faulhaber, A. Doost, and C. Ullrich. Advances in Web-Based Learning ICWL 2010, volume 6483 of Lecture Notes in Computer Science, page 210--219. Berlin, Heidelberg, Springer Berlin / Heidelberg, (2010)
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