1. Carlos E. Alchourrón. Philosophical foundations of deontic logic and the logic of defeasible conditionals. In Workshop on Deontic Logic in Computer Science, Amsterdam, 1991.
2. Craig Boutilier. Conditional logics of normality as modal systems. In Proc. of AAAI-90, pages 594–599, Boston, 1990.
3. Craig Boutilier. Inaccessible worlds and irrelevance: Preliminary report. In Proc. of IJCAI-91, pages 413–418, Sydney, 1991.
4. Craig Boutilier. Normative, subjunctive and autoepistemic defaults: Adopting the Ramsey test. In Proc. of KR-92, pages 685–696, Cambridge, 1992.
5. Craig Boutilier. What is a default priority? In Proceedings of Canadian Society for Computational Studies of Intelligence Conference, pages 140–147, Vancouver, 1992.