@inbook{403038,
title = {10. \'Ulohy z foronomie},
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 = {42-48},
url = {http://dml.mathdoc.fr/item/403038}
}
(éd.). 10. Úlohy z foronomie, dans Aritmetické hry a zábavy, GDML_Books, (1942), pp. 42-48. http://gdmltest.u-ga.fr/item/403038/