J. Wielemaker, G. Schreiber, and B. Wielinga. International Semantic Web Conference, volume 3729 of Lecture Notes in Computer Science, page 773-785. Springer, (2005)
B. Wielinga, G. Schreiber, J. Wielemaker, and J. Sandberg. Proceedings of the 1st International Conference on Knowledge Capture K-CAP '01: Victoria, Canada: 2001, October, 22-23, page 194-201. ACM Press, (2001)