1. C. Berge, “Balanced matrices”, Mathematical Programming 2 (1972) 19–31.
2. C. Berge, “Sur une extension de la théorie des matrices bi-stochastiques”, in: Dall'Aglio, ed., Studi de probabilita, satistitica e ricerca operativa, in onore di G. Pompilj. (Oderisi-Gubbio, Rome 1970) 475–482.
3. C. Berge and M. Las Vergnas, “Sur un théorème du type König pour hypergraphes”, Annals of the New York Academy of Sciences 175 (1970) 32–40.
4. V. Chvátal, “On certain polytopes associated with graphs”, Journal of Combinatorial Theory 18(B) (1975) 138–154.
5. V. Chvátal, “On the strong perfect graph conjecture”, Journal of Combinatorial Theory 20(B) (1976) 139–141.