1. J. A. White,Production Handbook, 4th edn., John Wiley, New York, ch. 8.3, 1987.
2. M. P. Groover and E. W. Zimmer,Computer-Aided Design and Manufacture, Prentice-Hall, Englewood Cliffs, ch. 13. 1984.
3. T. C. Chang and R. A. Wysk,An Introduction to Automated Process Planning Systems, Prentice-Hall, Englewood Cliffs, 1985.
4. N. Bryant,Managing Expert Systems, John Wiley, Chichester, 1988.
5. P. S. Sell,Expert Systems: A Practical Introduction, Macmillan, Basingstoke, 1985.