1. J. T. Tou, Knowledge Engineering,Int. J. of Comp. and Inf. Sci. 9(4):275?285 (1980).
2. G. Salton,Automatic Information Organization and Retrieval, McGraw-Hill, New York (1968).
3. W. S. Jevons,The Principles of Science: A Treatise on Logic and Scientific Method, Dover Publishing Company, New York (1958).
4. R. W. DePree, J. T. Tou, R. W. Swain, and C. Lin, A Relational Model for Knowledge Transfer,Proc. of the 1980 Int. Comp. Symp. (1980).
5. P. Harmon and D. King,Expert Systems, John Wiley and Sons, New York (1984).