| 1991 | A Constraint-Based Approach to Uncertain and Imprecise Reasoning. Application to Expert Systems. | T. Pontet |
| 1991 | Advance Prototyping. | Simon Parsons |
| 1991 | Revision in Propositional Calculus. | Odile Papini |
| 1991 | Probabilistic Default Reasoning Involving Continous Variables. | Gerhard Paass |
| 1991 | Every Complex System can be Determined by a Causal Probabilistic Network Without Cycles and Every Such Network Determines a Markov Field. | Ulrich G. Oppel |
| 1991 | Difference Fuzzy Relation Equations: Studies in Dynamical Systems. | Antonio Di Nola, Witold Pedrycz, Salvatore Sessa |
| 1991 | A Logic of Imprecise Monadic Predicades and its Relation to the S5-Modal Fuzzy Logic. | Akira Nakamura |
| 1991 | Induction of Uncertain Rules and the Sociopathicity Property in Dempster-Shafer Theory. | Yong Ma, David C. Wilkins |
| 1991 | Hierarchical Default Logic. | Craig MacNish |
| 1991 | Press - A Probabilistic Reasoning Expert System Shell. | Zhiyuan Luo, Alex Gammerman |
| 1991 | An Evidential Reasoning Approach to the Classification of Satellite Images. | Gabriele Lohmann |
| 1991 | Computing Extensions of Default Theories. | Franois Lvy |
| 1991 | Reasoning with Mass Distributions and the Context Model. | Rudolf Kruse, Jrg Gebhardt, Frank Klawonn |
| 1991 | Handling Partially Ordered Defaults in TMS. | Ulrich Junker, Gerhard Brewka |
| 1991 | Fuzzy Control Research at Siemens Corporate R&D. | Hans Hellendoorn, Michael Reinfrank |
| 1991 | A Hybrid Approach for Modeling Uncertainty in Terminological Logics. | Jochen Heinsohn |
| 1991 | Formalizing Pertinence Links in Inheritance Reasoning: Preliminary Report. | ric Grgoire |
| 1991 | Probabilistic Regions of Persistence. | Scott D. Goodwin, Eric Neufeld, Andr Trudel |
| 1991 | Linguistically expressed uncertainty: its elicitation and use in modular expert systems. | Llus Godo, Ramn Lpez de Mntaras |
| 1991 | Nonmonotonic inference, expectations, and neural networks. | Peter Grdenfors |
| 1991 | An Extension of the Possibility Theory in View of the Formalization of Approximate Reasoning. | L. Gacgne |
| 1991 | Abduction in Labelled Deductive Systems - A Conceptual Abstract. | Dov M. Gabbay |
| 1991 | Graded Default Logics. | Christine Froidevaux, Philippe Chatalic, Jrme Mengin |
| 1991 | An Extended Logic Language For Representing Belief. | John Fox, Paul J. Krause, Mirko Dohnal |
| 1991 | Handling Active Databases with Partial Inconsistencies. | Opher Etzion |