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4. W. H. Cunningham, Testing membership in matroid polyhedra,Report No. 81207—OR, Universität Bonn, 1981, to appear inJ. Combinatorial Th. Ser B.
5. W. H. Cunningham andJ. Edmonds, A combinatorial decomposition theory,Canad. J. Math. 32 (1980), 734–765.