University of Massachusetts: Description of the CIRCUS System as Used for MUC-3 Wendy Lehnert author Claire Cardie author David Fisher author Ellen Riloff author Robert Williams author 1991 text Third Message Understanding Conference (MUC-3): Proceedings of a Conference Held in San Diego, California, May 21-23, 1991 conference publication lehnert-etal-1991-university-massachusetts https://aclanthology.org/M91-1033/ 1991