| 1999 | A Case Study in Using Preference Logic Grammars for Knowledge Representations. Baoqiu Cui, Terrance Swift, David Scott Warren |
| 1999 | A Comparison of Sceptical NAF-Free Logic Programming Approaches. Grigoris Antoniou, Michael J. Maher, David Billington, Guido Governatori |
| 1999 | An Argumentation Framework of Reasoning about Actions and Change. Antonis C. Kakas, Rob Miller, Francesca Toni |
| 1999 | Annotated Revision Programs. V. Wiktor Marek, Inna Pivkina, Miroslaw Truszczynski |
| 1999 | Answer Set Planning (Abstract). Vladimir Lifschitz |
| 1999 | Belief, Knowledge, Revisions, and a Semantics of Non-Monotonic Reasoning. Ján Sefránek |
| 1999 | Characterizations of Classes of Programs by Three-Valued Operators. Pascal Hitzler, Anthony Karel Seda |
| 1999 | Classifying Semi-Normal Default Logic on the Basis of its Expressive Power. Tomi Janhunen |
| 1999 | Coherent Well-founded Annotated Logic Programs. Carlos Viegas Damásio, Luís Moniz Pereira, Terrance Swift |
| 1999 | Default Reasoning via Blocking Sets. Thomas Linke, Torsten Schaub |
| 1999 | Extending Disjunctive Logic Programming by T-norms. Cristinel Mateis |
| 1999 | Extending the Stable Model Semantics with More Expressive Rules. Patrik Simons |
| 1999 | Fixed-Parameter Complexity in AI and Nonmonotonic Reasoning. Georg Gottlob, Francesco Scarcello, Martha Sideri |
| 1999 | From Causal Theories to Logic Programs (Sometimes). Fangzhen Lin, Kewen Wang |
| 1999 | LUPS - A Language for Updating Logic Programs. José Júlio Alferes, Luís Moniz Pereira, Halina Przymusinska, Teodor C. Przymusinski |
| 1999 | Linear Tabulated Resolutions for the Well-Founded Semantics. Yi-Dong Shen, Li-Yan Yuan, Jia-Huai You, Neng-Fa Zhou |
| 1999 | Locally Determined Logic Programs. Douglas A. Cenzer, Jeffrey B. Remmel, Amy Vanderbilt |
| 1999 | Logic Programming and Nonmonotonic Reasoning, 5th International Conference, LPNMR'99, El Paso, Texas, USA, December 2-4, 1999, Proceedings Michael Gelfond, Nicola Leone, Gerald Pfeifer |
| 1999 | Many-Valued Disjunctive Logic Programs with Probabilistic Semantics. Thomas Lukasiewicz |
| 1999 | Minimal Founded Semantics for Disjunctive Logic Programming. Sergio Greco |
| 1999 | Monotone Expansion of Updates in Logical Databases. Michael I. Dekhtyar, Alexander Ja. Dikovsky, Sergey M. Dudakov, Nicolas Spyratos |
| 1999 | On the Role of Negation in Choice Logic Programs. Marina De Vos, Dirk Vermeir |
| 1999 | Practical Nonmonotonic Reasoning: Extending Inheritance Techniques to Solve Real-World Problems. Leora Morgenstern |
| 1999 | Pushing Goal Derivation in DLP Computations. Wolfgang Faber, Nicola Leone, Gerald Pfeifer |
| 1999 | Representing Transition Systems by Logic Programs. Vladimir Lifschitz, Hudson Turner |
| 1999 | Stable Model Semantics of Weight Constraint Rules. Ilkka Niemelä, Patrik Simons, Timo Soininen |
| 1999 | Towards First-Order Nonmonotonic Reasoning. Riccardo Rosati |
| 1999 | Transformations of Logic Programs Related to Causality and Planning. Esra Erdem, Vladimir Lifschitz |
| 1999 | Updating Extended Logic Programs through Abduction. Chiaki Sakama, Katsumi Inoue |
| 1999 | Using LPNMR for Problem Specification and Code Generation. Marco Cadoli |
| 1999 | World-Modeling vs. World-Axiomatizing. David A. McAllester |