1. Les problèmes de coloration en théorie des graphes;Berge;Publ. Inst. Statist. Univ. Paris,1960
2. C. Berge, Graphs and Hypergraphs, North-Holland, Amsterdam, 1973. Translated from the French by Edward Minieka, North-Holland Mathematical Library, Vol. 6.
3. R.E. Bixby, A Composition for Perfect Graphs, Topics on perfect graphs, North-Holland, Amsterdam, 1984, pp. 221–224.
4. The homogeneous set sandwich problem;Cerioli;Inf. Process. Lett.,1998
5. A. Cournier, Sur quelques Algorithmes de Décomposition de Graphes, Thése Université Montpellier II, France, 1993.