1. BBN PLUM: description of the PLUM system as used for MUC-4;Ayuso,1992
2. Subjective understanding: computer models of belief systems;Carbonell,1979
3. Towards a self-extending parser;Carbonell,1979
4. Script application: computer understanding of newspaper stories;Cullingford,1978
5. An overview of the FRUMP system;DeJong,1982