1. KAON2 – Homepage, Institut für Angewandte Informatik und Formale Beschreibungsverfahren (AIFB), Universität Karlsruhe (TH), 2007. , last visited April 2007.
2. Advanced Distributed Learning (ADL), Sharable Content Object Reference Model (SCORM), second ed., 2004, Overview (July 2004).
3. R. Albertoni, A. Bertone, M.D. Martino, Semantic web and information visualization, in: Proceedings of the First Italian Semantic Web Workshop on Semantic Web Applications and Perspectives (SWAP), Ancona, Italy, 2004.
4. A survey of temporal extensions of description logics;Artale;Annals of Mathematics and Artificial Intelligence (AMAI),2001
5. The development graph manager maya (system description);Autexier,2002