1. The Design and Analysis of Computer Algorithms;Aho,1974
2. Graphs and Hypergraphs;Berge,1973
3. On rigid circuit graphs;Dirac;Abh. Math. Sem. Univ. Hamburg,1961
4. Matching and a polyhedron with 0-1 vertices;Edmonds;J. Res. Nat. Bur. Standards,1965
5. Flows in Networks;Ford,1962