B. Smith, und C. Welty. FOIS '01: Proceedings of the international conference on Formal Ontology in Information Systems, New York, NY, USA, ACM Press, (2001)
X. Wu, L. Zhang, und Y. Yu. WWW '06: Proceedings of the 15th international conference on World Wide Web, Seite 417--426. New York, NY, USA, ACM Press, (2006)