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R. Lindner. Spezifikationen, Normen und Standards für Lernmaterialien. In Jörg M. Haake, Gerhard Schwabe, Martin Wessner, editors, CSCL-Kompendium. Lehr- und Handbuch zum computerunterstützten kooperativen Lernen. pages 341-356, Oldenbourg, 2004.