@book{403026, title = {Aritmetick\'e hry a z\'abavy}, series = {GDML\_Books}, publisher = {Jednota \v cesk\'ych matematik\r u a fysik\r u}, address = {Praha}, year = {1942}, language = {cs}, url = {http://dml.mathdoc.fr/item/403026} }
Čupr, Karel. Aritmetické hry a zábavy. GDML_Books (1942), http://gdmltest.u-ga.fr/item/403026/