I. Horrocks. Principles of Knowledge Representation and Reasoning: Proceedings
of the Sixth International Conference (KR'98), page 636--647. Morgan Kaufmann Publishers, San Francisco, California, (June 1998)\\ http://www.cs.man.ac.uk/~horrocks/Publications/ \\ download/1998/kr98.ps.gz.
I. Horrocks. Principles of Knowledge Representation and Reasoning: Proceedings of the Sixth International Conference (KR'98), page 636--647. Morgan Kaufmann Publishers, San Francisco, California, (June 1998)\\ http://www.cs.man.ac.uk/~horrocks/Publications/ \\ download/1998/kr98.ps.gz.
I. Horrocks. Proceedings of the 6th International Conference on Principles of Knowledge Representation and Reasoning (KR-98), page 636--649. San Francisco, Morgan Kaufmann Publishers, (June 1998)