UMass/Hughes: Description of the CIRCUS System Used for MUC-5 W Lehnert author J McCarthy author S Soderland author E Riloff author C Cardie author J Peterson author F Feng author C Dolan author S Goldman author 1993 text Fifth Message Understanding Conference (MUC-5): Proceedings of a Conference Held in Baltimore, Maryland, August 25-27, 1993 conference publication lehnert-etal-1993-umass https://aclanthology.org/M93-1023/ 1993