1. On critical graphs, Théorie des Graphes;Andrásfai,1967
2. Graphes et Hypergraphes;Berge,1970
3. Une propriété des graphes k-stables critiques, Combinatorial Structures;Berge,1970
4. C. Berge and A.J. Hoffman, Multicolorations dans les hypergraphes unimodulaires, Proc. Paris Conf. July 1976, C.N.R.S. Publ. (to appear).
5. The coloring numbers of the direct product of two hypergraphs, Hypergraph Seminar 1972;Berge,1974