I. Horrocks, und P. Patel-Schneider. WWW '03: Proceedings of the 12th international conference on World Wide Web, Seite 39--47. New York, NY, USA, ACM, (2003)
I. Horrocks, und P. Patel-Schneider. Proc.\ of the Twelfth International World Wide Web Conference (WWW2003), Seite 39--47. Budapest, Hungary, ACM, (2003)\\ http://www.cs.man.ac.uk/~horrocks/Publications/ \\ download/2003/p50-horrocks.pdf.
I. Horrocks, und P. Patel-Schneider. Proceedings of the Twelfth International World Wide Web Conference (WWW2003), Seite 39--47. Budapest, Hungary, ACM, (2003)