1. Defeasible reasoning and logic programming;Colburn;Minds and Machines,1991
2. gIBIS: A tool for all reasons;Conklin;J. Am. Soc. Information Systems,1989
3. An approach to default reasoning based on a first-order conditional logic: revised report;Delgrande;Artif. Intell.,1988
4. H. Geffner, Default Reasoning: Causal and Conditional Theories. MIT, Cambridge, MA, 1992.
5. M. Ginsberg, AI and nonmonotonic reasoning, in: D. Gabbay, C. Hogger (Eds.), Handbook of Logic for Artificial Intelligence and Logic Programming, Vol. III, Oxford Univ. Press, Oxford, 1994.