Mobile eLearning Content on Demand Engelhardt, Michael Hildebrand, Arne Lange, Dagmar Schmidt, Thomas Werlitz, Mathias 2006 - ReposIt
The Hypermedia eLearning Object System: Exploiting Learning Objects in a Semantic Educational Web Engelhardt, Michael Hildebrand, Arne Schmidt, Thomas Werlitz, Mathias 2004 - ReposIt