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Covers of digraphs. (English) Zbl 0442.05056

05C70 Edge subsets with special properties (factorization, matching, partitioning, covering and packing, etc.)
05C20 Directed graphs (digraphs), tournaments
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[1] DÖRFLER W.: Double covers of graphs and hypergraphs. Proc. Int. Koll. Graphentheorie, Oberhof, 1978 · Zbl 0423.05032
[2] DÖRFLER W.: Multiple covers of hypergraphs. Annals New York Acad. Sci., 1978 · Zbl 0423.05032
[3] HARARY F.: Graph Theory. Addison-Wesley, Reading, Mass., 1969. · Zbl 0182.57702
[4] HARARY F., NORMAN Z., CARTWRIGHT D.: Structural Models: An Introduction to the Theory of Directed Graphs. Wiley, New York, 1965. · Zbl 0139.41503
[5] MASSEY W. S.: Algebraic Topology: An Introduction. Harcourt, Brace and World, New York, 1967. · Zbl 0153.24901
[6] WALLER D. A.: Double covers of graphs. Bull. Austral. Math. Soc, 14, 1976, 233-248. · Zbl 0318.05113
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