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S.  Zeini, G\'f6hnert, T., Hoppe, H. U., und Krempel, L., ?The impact of measurement time on subgroup detection in online communities?, in Proceedings of the 2012 International Conference on Advances in Social Networks Analysis and Mining (ASONAM 2012), 2012, S. 389?394.\par \par N.  Malzahn, Giemza, A., und Hoppe, H. U., ?IT-Architekturen und Infrastrukturen?, in CSCL-Kompendium 2.0 - Lehr- und Handbuch zum computerunterst\'fctzten kooperativen Lernen, J.  Haake, Schwabe, G., und Wessner, M., Hrsg. 2012.\par \par J.  Hafkesbrink, Hoppe, H. U., und Schroll, M., ?Innovation Strategies beyond Traditional Management - Future Research and Development Requirements for Interactive Added Value Partnerships?, in Competences Management for Open Innovation. Tools and IT support to unlock the innovation potential beyond company boundaries, J.  Hafkesbrink, Hoppe, H. U., und Schlichter, J., Hrsg. 2010, S. 309?316.\par \par }