1. Graphs and Hypergraphs;Berge,1973
2. Perfect graphs;Berge;Studies in Graph Theory,1975
3. A characterization of rigid circuit graphs;Buneman;Discrete Math.,1974
4. Set-packing and threshold graphs;Chvátal;University of Waterloo Research Report, CORR 73-21,1973
5. Aggregation of inequalities in integer programming;Chvátal;Ann. Discrete Math.,1977