K. Winkler, and M. Spiliopoulou. Proceedings of the 6th European Conference on Principles and Practice of Knowledge Discovery in Databases (PKDD'02), page 461--474. Helsinki, Finland, Springer Verlag, (August 2002)
K. Winkler, and M. Spiliopoulou. Proceedings of the K-CAP 2001 Workshop on Knowledge Markup and Semantic Annotation, page 59--68. Victoria, BC, Canada, (October 2001)
J. Kietz, R. Volz, and A. Maedche. Proc. of 4th Conf. on Computational Natural Language Learning and of the 2nd Learning Language in Logic Workshop, page 167--175. Somerset, New Jersey, Association for Computational Linguistics, (2000)
D. Faure, and C. Nédellec. Knowledge Acquisition, Modeling and Management: 11th European Workshop, EKAW '99, Dagstuhl Castle, Germany, May 1999: Proceedings, volume 1621 of Lecture Notes in Computer Science, Springer-Verlag, Heidelberg, (1999)