1. J.J. Alferes, personal communication, 1993.
2. Top-down query evaluation for well-founded semantics with explicit negation;Alferes,1994
3. SLX — A top-down derivation procedure for programs with explicit negation;Alferes,1994
4. A logic programming system for non-monotonic reasoning;Alferes;J. Automat. Reasoning,1995
5. Scenario semantics of extended logic programs;Alferes,1993