@article{ARM_1980_16_4_a2,
author = {Chajda, Ivan},
title = {Relational classes and their characterizations},
journal = {Archivum mathematicum},
pages = {199--203},
year = {1980},
volume = {16},
number = {4},
mrnumber = {594466},
zbl = {0449.08002},
language = {en},
url = {http://geodesic.mathdoc.fr/item/ARM_1980_16_4_a2/}
}
Chajda, Ivan. Relational classes and their characterizations. Archivum mathematicum, Tome 16 (1980) no. 4, pp. 199-203. http://geodesic.mathdoc.fr/item/ARM_1980_16_4_a2/
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