M. Mazzieri, and A. Dragoni. Proceedings of the International Workshop on Emergent Semantics and Ontology Evolution (ESOE2007) at ISWC/ASWC2007, Busan, South Korea, (November 2007)
N. Nikitina, S. Rudolph, and B. Glimm. Proceedings of the 22nd International Joint Conference on Artificial Intelligence (IJCAI 2011), page 1027-1032. (2011)
G. Qi, and F. Yang. Proceedings of the 2nd International Conference on Web Reasoning and Rule Systems (RR 2008), volume 5341 of Lecture Notes in Computer Science, page 74--88. Karlsruhe, Germany, Springer-Verlag, (October 2008)