1. C.-L. Chang and R.C.-T. Lee, Symbolic logic and mechanical theorem proving (Academic Press, London, 1973).
2. D.P. Friedman and D.S. Wise, CONS should not evaluate its arguments, in: S. Michaelson and R. Milner, eds., Automata, Languages and Programming, (Edinburgh University Press), 257–284.
3. S. Gregory, Parallel Logic Programming in PARLOG (Addison-Wesley, 1987).
4. P. Henderson and J.H. Morris, A lazy evaluator, in: Proceedings of the 3rd ACM Symposium on Principles of Programming Languages, 1976, ACM, 95–103.
5. Ph. Jorrand, Design and implementation of a parallel inference machine for first order logic, in: Proc. PARLE Conference (Lecture Notes in Computer Science No. 259, Springer-Verlag, 1987).