GE NLToolset: MUC-4 Test Results and Analysis Lisa Rau author George Krupka author Paul Jacobs author 1992 text Fourth Message Understanding Conference (MUC-4): Proceedings of a Conference Held in McLean, Virginia, June 16-18, 1992 conference publication rau-etal-1992-ge https://aclanthology.org/M92-1008/ 1992