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N.  Malzahn, Giemza, A., and Schloetmann, J., ?Fokussierungseffekte bei Multimedia-Guides?, Museum Aktuell, vol. 2014, no. 09, pp. 9-14, 2014.\par \par L.  Bollen, Giemza, A., and Hoppe, H. U., ?Flexible analysis of user actions in heterogeneous distributed learning environments?, in Times of Convergence. Technologies Across Learning Contexts, Springer, 2008.\par \par A.  Harrer, Ziebarth, S., Giemza, A., and Hoppe, H. U., ?A framework to support monitoring and moderation of e-discussions with heterogeneous discussion tools?, in  8th IEEE International Conference on Advanced Learning Technologies (ICALT'08), 2008, pp. 41?45.\par \par }