Chiara Ghidini, Axel-Cyrille Ngonga Ngomo, Stefanie N. Lindstaedt, Tassilo Pellegrini: Proceedings the 7th International Conference on Semantic Systems, I-SEMANTICS 2011, Graz, Austria, September 7-9, 2011. ACM International Conference Proceeding Series, ACM 2011, ISBN 978-1-4503-0621-8