TIPSTER SHOGUN System (Joint GE-CMU): MUC-4 Test Results and Analysis George Krupka author Paul Jacobs author Michael Mauldin author Todd Kaufmann author Ira Sider author 1992 text Fourth Message Understanding Conference (MUC-4): Proceedings of a Conference Held in McLean, Virginia, June 16-18, 1992 conference publication krupka-etal-1992-tipster https://aclanthology.org/M92-1009/ 1992