user- Communications of the ACM 53(12):34–36 (December 2010)
- Science 321(5887):395-399 (July 2008)
- Morgan Kaufmann, San Francisco, CA, 2. edition, (2005)
- Extraction et gestion des connaissances EGC'2006, Actes des sixièmes journées Extraction et Gestion des Connaissances, Lille, France, 17-20 janvier 2006, 2 Volumes, volume RNTI-E-6 of Revue des Nouvelles Technologies de l'Information, page 5-10. Cépaduès-Éditions, (2006)
- Springer, Berlin, (2008)
- Lecture Notes in Computer Science Springer, Berlin, (2010)
- Lecture Notes in Computer Science Springer, Berlin, (2007)
- MIT Press, Cambridge, MA, Paperback edition, (2006)
- Morgan Kaufmann, Burlington, MA, 2. edition, (2010)
- HMD -- Praxis der Wirtschaftsinformatik (February 2010)
- Proceedings of the Conceptual Structures Tool Interoperability Workshop at the 14th International Conference on Conceptual Structures, page 87-102. Aalborg University Press, (2006)
