@inbook{402939,
title = {II. Kongruence},
booktitle = {\'Uvod do element\'arn\'\i\ teorie \v c\'\i seln\'e},
series = {GDML\_Books},
publisher = {Jednota \v cs. matematik\r u a fysik\r u},
address = {Praha},
year = {1931},
pages = {30-55},
url = {http://dml.mathdoc.fr/item/402939}
}
(éd.). II. Kongruence, dans Úvod do elementární teorie číselné, GDML_Books, (1931), pp. 30-55. http://gdmltest.u-ga.fr/item/402939/