@article{ARM_1989_25_1-2_a4,
author = {Gr\"atzer, G. and Wenzel, G. H.},
title = {Tolerances, covering systems, and the axiom of choice},
journal = {Archivum mathematicum},
pages = {27--34},
year = {1989},
volume = {25},
number = {1-2},
mrnumber = {1189196},
zbl = {0711.08002},
language = {en},
url = {http://geodesic.mathdoc.fr/item/ARM_1989_25_1-2_a4/}
}
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/
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