1. Robison, J. A.,A machine-oriented logic based on the resolution principle, J. Ass. Comput. Mach.12, (1965), 23–41.
2. Robinson, J. A.,Computational Logic: the unification computation, in Machine Intelligence6, 63–72.
3. Benturini Zilli M., Cerimele M. M.,COR: a program for proving theorems in first-order logic, (unpublished).
4. Venturini Zilli M.,Complessità dell'algoritmo di unificazione, in Proceedings of the Convegno di Informatica teorica, Mantova (1974), 87–96.