On number of covering arcs in orderings
Commentationes Mathematicae Universitatis Carolinae, Tome 22 (1981) no. 4, pp. 721-733.

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Classification : 05A15, 05C20, 05C30, 05C70
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     title = {On number of covering arcs in orderings},
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Koubek, Václav; Rödl, Vojtěch. On number of covering arcs in orderings. Commentationes Mathematicae Universitatis Carolinae, Tome 22 (1981) no. 4, pp. 721-733. http://geodesic.mathdoc.fr/item/CMUC_1981__22_4_a7/