@inbook{403037, title = {9. Slovn\'\i\ rovnice}, booktitle = {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}, pages = {31-42}, url = {http://dml.mathdoc.fr/item/403037} }
(éd.). 9. Slovní rovnice, dans Aritmetické hry a zábavy, GDML_Books, (1942), pp. 31-42. http://gdmltest.u-ga.fr/item/403037/