1. A first-order conditional logic for prototypical properties;Delgrande;Artif. Intell.,1987
2. General theory of cumulative inference;Makinson,1988
3. Probabilistic Reasoning in Intelligent Systems: Networks of Plausible Inference;Pearl,1988
4. Nonmonotonic reasoning, preferential models and cumulative logics;Kraus;Artif. Intell.,1990
5. System Z: a natural ordering of defaults with tractable applications to nonmonotonic reasoning;Pearl,1990