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\bibitem{Collins_etal1997} Collins, J. A., Greer, J. E., Kumar, V. S., McCalla, G. I., Meagher, P., \& Tkatch, R. (1997). Inspectable user models for just-in-time workplace training. In A. Jameson, C. Paris, \& C. Tasso (Eds.), (pp. 327--337). User modeling, The Sixth International Conference on User Modeling. Vienna, Austria: Springer Vienna.

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