GE NLToolset: MUC-3 Test Results and Analysis George Krupka author Lucja Iwariska author Paul Jacobs author Lisa Rau author 1991 text Third Message Understanding Conference (MUC-3): Proceedings of a Conference Held in San Diego, California, May 21-23, 1991 conference publication krupka-etal-1991-ge https://aclanthology.org/M91-1007/ 1991