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R. Lokaiczyk, E. Godehardt, A. Faatz, M. Goertz, A. Kienle, M. Wessner, and A. Ulbrich, "Exploiting context information for identification of relevant experts in collaborative workplace-embedded e-learning environments," in Creating New Learning Experiences on a Global Scale: Second European Conference on Technology Enhanced Learning, 2007, pp. 217-231.