C. Reed. IJCAI '99: Proceedings of the Sixteenth International Joint Conference on Artificial Intelligence, page 876--883. San Francisco, CA, USA, Morgan Kaufmann Publishers Inc., (1999)
C. Reed, and D. Long. Proceedings of the 17th International Conference on Computational Linguistics and 36th Annual Meeting of the Association for Computational Linguistics (COLING-ACL98), page 1091--1097. Montreal, Canada, (1998)