In: N.S. Sridharan (Hrsg.). Proceedings IJCAI-89. International Joint Conference on Artificial Intelligence (IJCAI-89), 11th, August 20-25, Detroit, MI, USA, Pages 1249-1254, Vol. 2, ISBN 1-55860-094-9, Morgan Kaufmann, 8/1989.
In: H. Burckard; H. Höhne; B. Neumann (Hrsg.). Mustererkennung 1989 - Proceedings 11. DAGM-Symposium. Annual Symposium of the German Association for Pattern Recognition (DAGM-1989), 11th, October 2-4, Hamburg, Germany, Pages 274-278, Informatik Fachbericht, Vol. 219, ISBN 3-540-51748-0, Springer, 10/1989.
In: 4th Conference of the European Chapter of the Association for Computational Linguistics. Conference of the European Chapter of the Association for Computational Linguistics (EACL-89), 4th, April 10-12, Manchester, United Kingdom, Pages 272-281, ACL, 1989.
In: 27th Annual Meeting of the Association for Computational Linguistics. Annual Meeting of the Association for Computational Linguistics (ACL-89), June 26-29, Vancouver, BC, Canada, Pages 212-219, ACL, 1989.
In: N. S. Sridharan (Hrsg.). 11th International Joint Conference on Artificial Intelligence. International Joint Conference on Artificial Intelligence (IJCAI-89), April 20-25, Detroit, MI, USA, Pages 1518-1523, Vol. 2, Morgan Kaufmann Publishers, 1989.