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[1] DÖRFLER W.: Double covers of graphs and hypergraphs. Proc. Int. Koll. Graphentheorie, Obeгhof, 1978 (to appear).
[2] DÖRFLER W.: Multiple covers of hypergraphs. Annals New York Acad. Sci., 1978 (to appear). MR 0556021
[3] HARARY F.: Gгaph Theory. Addison-Wesley, Reading, Mass., 1969. MR 0256911
[4] HARARY F., NORMAN Z., CARTWRIGHT D.: Structuгal Models: An Introduction to the Theoгy of Directed Graphs. Wiley, New Yoгk, 1965.
[5] MASSEY W. S.: Algebгaic Topology: An Introduction. Harcouгt, Brace and Woгld, New York, 1967. MR 0211390
[6] WALLER D. A.: Double covers of graphs. Bull. Austral. Math. Soc, 14, 1976, 233-248. MR 0406876 | Zbl 0318.05113
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