Tolerances, covering systems, and the axiom of choice
Archivum mathematicum, Tome 25 (1989) no. 1-2, pp. 27-34.

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Classification : 03E25, 06B10, 08A05, 08A30
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     title = {Tolerances, covering systems, and the axiom of choice},
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Grätzer, G.; Wenzel, G. H. Tolerances, covering systems, and the axiom of choice. Archivum mathematicum, Tome 25 (1989) no. 1-2, pp. 27-34. http://geodesic.mathdoc.fr/item/ARM_1989__25_1-2_a4/