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A. Kienle and T. Herrmann, “Integration of Communication, Coordination, and Learning Materials: A Guide for the Functionality of Collaborative Learning Environments,” in Proceedings of the 36th Annual Hawaii International Conference on System Sciences, 2003, Los Alamitos, CA: IEEE Computer Society Press, 2003, pp. 33–33. doi: https://doi.ieeecomputersociety.org/10.1109/HICSS.2003.1173732