Geodesic
Skeletons in multigraphs
Commentationes Mathematicae Universitatis Carolinae, Tome 34 (1993) no. 4, pp. 689-696.

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Under a multigraph it is meant in this paper a general incidence structure with finitely many points and blocks such that there are at least two blocks through any point and also at least two points on any block. Using submultigraphs with saturated points there are defined generating point sets, point bases and point skeletons. The main result is that the complement to any basis (skeleton) is a skeleton (basis).
Classification : 05B30, 05C99, 20N05
Keywords: multigraph; submultigraph with saturated vertices; generating vertex set; vertex basis; skeleton 
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     title = {Skeletons in multigraphs},
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Havel, Václav; Klouda, Josef. Skeletons in multigraphs. Commentationes Mathematicae Universitatis Carolinae, Tome 34 (1993) no. 4, pp. 689-696. http://geodesic.mathdoc.fr/item/CMUC_1993__34_4_a6/