in EPIA 89, 4th Portuguese Conference on Artificial Intelligence, Lisbon, Portugal, September 26-29, 1989, Proceedings in Lecture Notes in Computer Science, ISSN: 0302-9743
Volume: 390, Pages: 276-285
Conference
4Th Portuguese Conference on Artificial Intelligence, Epia 1989, Date: 26 September 1989 through 29 September 1989