R. Jäschke, L. Marinho, A. Hotho, L. Schmidt-Thieme, and G. Stumme. Workshop Proceedings of Lernen - Wissensentdeckung - Adaptivität (LWA 2007), page 13-20. Martin-Luther-Universität Halle-Wittenberg, (September 2007)
P. Mika. Web Semantics: Science, Services and Agents on the World Wide Web, 5 (1):
5 -- 15(2007)Selected Papers from the International Semantic Web Conference, International Semantic Web Conference (ISWC2005).