1. Acyclic programs;Apt,1990
2. Intensional updates: abduction via deduction;Bry;Proc. Internat. Conf. on Logic Programming'90,1990
3. Negation as failure;Clark,1978
4. On the relationship between abduction and deduction;Console;J. Logic Computation,1991
5. Abduction in logic programming with equality;Cox;Proc. Internat. Conf. on Fifth Generation Computer Systems 1992,1992