1. A model-driven question answering system for mixed-initiative computer assisted instruction;Brown;IEEE Transactions on Systems, Man and Cybernetics,1973
2. SOPHIE: a sophisticated instructional environment for teaching electronic troubleshooting (an example of AI in CAI);Brown,1974
3. Multiple representations Of knowledge for tutorial reasoning;Brown,1975
4. AI in CAI: an artificial intelligence approach to computerassisted instruction;Carbonell;IEEE Trans. Man-Machine Systems,1970
5. Natural semantics in artificial intelligence;Carbonell,1973