@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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