@inproceedings{TUC-HCIS/GZHP12, author = "S. Gross and X. Zhu and B. Hammer and N. Pinkwart", title = "Cluster Based Feedback Provision Strategies in Intelligent Tutoring Systems", year = 2012, booktitle = "Proceedings of the 11th International Conference on Intelligent Tutoring Systems (ITS)", publisher = "Springer Verlag", number = 7315, keywords = "fit" }