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\bibitem{Greer_etal1998} Greer, J. E., McCalla, G. I., Cooke, J., Collins, J. A., Kumar, V., Bishop, A., et al. (1998). The intelligent helpdesk: Supporting peer-help in a university course. In B. P. Goettl, H. M. Halff, C. L. Redfield, \& V. J. Shute (Eds.), (pp. 494--503). The International Conference on Intelligent tutoring systems. Berlin, Germany: Springer-Verlag Berlin Heidelberg.

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