@article{104672,
author = {Josef Zapletal},
title = {Distinguishing subsets of semi-groups and groups},
journal = {Archivum Mathematicum},
volume = {004},
year = {1968},
pages = {241-251},
zbl = {0325.20059},
mrnumber = {0263958},
language = {en},
url = {http://dml.mathdoc.fr/item/104672}
}
Zapletal, Josef. Distinguishing subsets of semi-groups and groups. Archivum Mathematicum, Tome 004 (1968) pp. 241-251. http://gdmltest.u-ga.fr/item/104672/
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