1. Bruynooghe, M. and Pereira L. M., “Deduction Revision by Intelligent Backtracking,” inProlog Implementation (J. A. Campbell, ed.), pp. 194–215, 1984.
2. Chang, C. C. and Lee, D. C. T.,Symbolic Logic and Mechanical Theorem Proving, Academic Press, 1973.
3. Cox, P. T., “Finding Backtrack Points for Intelligent Backtracking,” inProlog Implementation (J. A. Campbell, ed.), pp. 216–233, 1984.
4. Jaffar, J., Lassez, J-L and Lloyd, J. W., “Completeness of the Negation as Failure Rule,”Proceedings of the International Joint Conference on Artificial Intelligence, pp. 500–506, 1983.
5. Kowalski, R. A.,Logic for Problem-Solving, North-Holland, 1981.