1. Graphes et Hypergraphes;Berge,1970
2. Properties of graphs with constraints on degrees;Bondy;Studia Sci. Math. Hung.,1969
3. Set-packing problems and threshold graphs;Chvátal,1973
4. A decomposition theorem for partially ordered sets;Dilworth;Ann. of Math.,1950
5. Split graphs;Foldes,1976