| 1989-004 | Patrick Doherty: A Correspondence Between Inheritance Hierarchies and a Logic
of Preferential Entailment. Proceedings of Methodologies for Intelligent Systems, IV, 1989.
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| 1989-001 | Erik Sandewall: Combining Logic and Differential Equations for Describing Real-World Systems. Proceedings of First Conference on Principles of Knowledge Representation and Reasoning, 1989, pages 412-420.
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| 1989-002 | Erik Sandewall: Filter Preferential Entailment for the Logic of Action in Almost Continuous Worlds. Proceedings of International Joint Conference on Artificial Intelligence, 1989, pages 894-899.
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| 1989-003 | Erik Sandewall: A Decision Procedure for a Theory of Actions and Plans. Proceedings of Methodologies for Intelligent Systems, IV, 1989.
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