1. Amodel foradaptive problem solvingapplied tonatural language recognition;Harris,1972
2. ROBOT, a high performance natural language interface for database query;Harris,1977
3. Natural language database query: using the database itself as a definition of world knowledge and as an extension of the dictionary;Harris,1977
4. REQUEST: a natural language question answering system;Plath;IBM Journal of Research and Development,1976
5. A user's experience of the ROBOT;Pruitt,1977