1. H. Atabakhche. Utilisation conjointe de l'intelligence artificielle et des réseaux de Petri: Application au contrôle d'exécution d'un plan de fabrication. PhD thesis, Université Paul Sabatier, Toulouse, december 1987.
2. Grady Booch. Object-oriented development. IEEE Trans. on Software Engineering, SE-12:211–221, 1986.
3. R. E. Bellman and L. A. Zadeh. Decision-making in a fuzzy environment. In R. R. Yager, editor, Fuzzy sets and applications. John Wiley and Sons, 1988.
4. R. Valette J. Cardoso and D. Dubois. Monitoring manufacturing systems by means of petri nets with imprecise markings. In IEEE International Symposium on Intelligent Control 1989, pages 233–238, Albany, New York, september 1989.
5. D. Dubois and H. Prade. An introduction to possibilistic and fuzzy logics. In P. Smets, editor, Non-Standard logics for automated reasoning. Academic Press, 1988.