1. Proof normalization for resolution and paramodulation
2. The myth of the one true logic
3. R.M. BURSTALL, and J.A. GOGUEN, 1977 . Putting theories together to make specifications . Proceedings of the Fifth International Joint Conference on Artificial Intelligence, Cambridge, MA, pp.1045 -1058 .
4. J. CHOMICKI, and N.H. MINSKY, 1985 . Towards a programming environment for large Prolog programs. Proceedings, 1985 Symposium on Logic Programming, Boston, MA . IEEE Computer Society Press, Washington, DC, pp.230 -241 .