P. Groot, A. ten Teije, и F. Harmelen. Proceedings of the Ninth International Conference on Principles of Knowledge Representation and Reasoning (KR'04), Whistler, Colorado, (2004)
P. Groot, F. van Harmelen, и A. ten Teije. In Proceedings of the 12th International Conference on Knowledge Acquisition, Modeling and Management (EKAW'00), (октября 2000)