1. Knowledge in Flux;Gärdenfors,1988
2. Conditionals, uncertain rules and belief revision;Clarke;Artif. Intell. Rev.,1991
3. Conditional Inference and Logic for Intelligent Systems: A Theory of Measure-Free Conditioning;Goodman,1991
4. A Mathematical Theory of Evidence;Shafer,1976
5. Belief functions;Smets,1988