%0 Journal Article %1 mugnier1996reprsenter %A Mugnier, Marie-Laure %A Chein, Michel %B 1 %C Lavoisier %D 1996 %J Revue d'Intelligence Artificielle %K Représenter avec connaissances des et graphes raisonner %N 1 %P 7-56 %T Représenter des connaissances et raisonner avec des graphes %V 10 %X We briefly present our point of view about conceptual graphs: graphs with ordered labels - for representing knowledge - with graph operations - for reasoning. We propose a formalism for simple conceptual graphs which generalizes the usually considered model, and preserves its fundamental properties. Links with important combinatorial notions (graph morphism, Constraint Satisfaction Problems) are established. Finally a notion of nested conceptual graph is fonnally defined, which significantly extends the simple model.