BBN PLUM: MUC-4 Test Results and Analysis Ralph Weischedel author Damaris Ayuso author Sean Boisen author Heidi Fox author Herbert Gish author Robert Ingria author 1992 text Fourth Message Understanding Conference (MUC-4): Proceedings of a Conference Held in McLean, Virginia, June 16-18, 1992 conference publication weischedel-etal-1992-bbn https://aclanthology.org/M92-1007/ 1992