S. Staab, and U. Hahn. Proceedings of the Sixteenth International Joint Conference on Artificial
Intelligence, IJCAI 99, Stockholm, Sweden, July 31 - August 6, 1999.
2 Volumes, 1450 pages, page 1247--1252. (1999)
Proceedings of the Sixteenth International Joint Conference on Artificial
Intelligence, IJCAI 99, Stockholm, Sweden, July 31 - August 6, 1999.
2 Volumes, 1450 pages