1. M. Billaud, Some Backtracking Graph Algorithms expressed by Graph Rewriting Systems with Priorities, Report LABRI 8989.
2. M. Billaud, Un Interpréteur pour les Systèmes de Réécriture de Graphes avec Priorités, Report LABRI 9040 (in french).
3. M. Billaud, P. Lafon, Y. Métivier, E. Sopena, Graph Rewriting Systems with Priorities, in Graph-theoretic Concepts in Computer Science, 15th Workshop on Graphs'89, LNCS 411, pp. 94–106.
4. J.L. Lafaye, Mémoire pour l'Obtention du D.U.T., Département Informatique de l'IUT ‘A', Université Bordeaux I (1990).
5. I. Litovsky, Y. Métivier, Graph Rewriting Systems as a Tool to design and to prove Graph and Network Algorithms, Report LABRI 9070.