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Kostenpflichtiger Content in Lernportalen

Dennis Reil, Hans-Jürgen Appelrath. Kostenpflichtiger Content in Lernportalen. In Gregor Engels, Silke Seehusen, editors, DeLFI 2004: Die e-Learning Fachtagung Informatik, Tagung der Fachgruppe e-Learning der Gesellschaft für Informatik e.V. (GI) 6.-8. September 2004 in Paderborn. Volume 52 of LNI, pages 91-102, GI, 2004.

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