1. The Description Logic handbook: Theory, implementation, and applications;Baader,2003
2. The semantic web;Berners-Lee;Scientific American,2001
3. Bizer, C., & Seaborne, A. (2004). D2RQ-treating non-RDF databases as virtual RDF graphs. In Proceedings of the third international semantic web conference (ISWC2004).
4. The Unified Medical Language system (UMLS): Integrating biomedical terminology;Bodenreider;Nucleic Acids Research,2004
5. Contextualizing ontologies;Bouquet;Web Semantics: Science, Services and Agents on the World Wide Web,2004