@InProceedings{BeKrPiWo2007,
        AUTHOR = {Benzmüller, Christoph and Kruijff-Korbayova, Ivana and Pinkal, Manfred and Wolska, Magdalena},
        TITLE = {Natural language dialog with a tutor system for mathematical proofs},
        YEAR = {2007},
        BOOKTITLE = {Proceedings of the Joint Chinese-German Workshop on Cognitive Systems 2005, Shanghai, China},
        VOLUME = {4429},
        PAGES = {1-14},
        EDITOR = {Lu, Ruqian and Siekmann, Joerg and Ullrich, Carsten},
        SERIES = {Lecture Notes in Artificial Intelligence},
        PUBLISHER = { Springer-Verlag},
        NOTE = {MP} }
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