1. Converting linear programs to network problems;Bixby;Math. Operations Res,1980
2. Uniquely representable combinatorial geometries;Brylawski,1976
3. Planar permutation graphs;Chartrand;Ann. Inst. Henri Poincare,1967
4. Adjoints of a geometry;Cheung;Canad. Math. Bull,1974
5. Orthogonal representations of combinatorial geometries;Crapo,1970