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N.  Malzahn, Harrer, A., und Hoppe, H. U., ?Software- und Systementwicklung?, CSCL-Kompendium 2.0 - Lehr- und Handbuch zum computerunterst\'fctzten kooperativen Lernen, 2012.\par \par A.  Wichmann, Harrer, A., und Hoppe, H. U., ?The e-moderation challenge: Teacher\'b4s styles and strategies during e-discussions?, 2008.\par \par A.  Harrer, Ziebarth, S., Giemza, A., und 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, S. 41?45.\par \par A.  Harrer und Malzahn, N., ?Bridging the gap-towards a graphical modeling language for learning designs and collaboration scripts of various granularities?, in Advanced Learning Technologies, 2006. Sixth International Conference on, 2006, S. 296?300.\par \par }