J. Martinez Lastra, и I. Delamer. Advances in Web Semantics I: Ontologies, Web Services and Applied Semantic Web, том 4891 из Lecture Notes in Computer Science, Springer, Berlin, (2009)
F. Suchanek, G. Kasneci, и G. Weikum. Proceedings of the 16th international conference on World Wide Web, стр. 697--706. New York, NY, USA, ACM, (2007)