@book{403650, title = {Kongruence}, series = {GDML\_Books}, publisher = {Mlad\'a fronta}, address = {Praha}, year = {1968}, language = {cs}, url = {http://dml.mathdoc.fr/item/403650} }
Apfelbeck, Alois. Kongruence. GDML_Books (1968), http://gdmltest.u-ga.fr/item/403650/