F. Suchanek, G. Kasneci, and G. Weikum. Proceedings of the 16th international conference on World Wide Web, page 697--706. New York, NY, USA, ACM, (2007)
F. Baader, B. Ganter, B. Sertkaya, and U. Sattler. Proceedings of the 20th international joint conference on Artifical intelligence, page 230--235. San Francisco, CA, USA, Morgan Kaufmann Publishers Inc., (2007)
S. Middleton, D. Roure, and N. Shadbolt. K-CAP '01: Proceedings of the 1st international conference on Knowledge capture, page 100--107. New York, NY, USA, ACM, (2001)