10. Úlohy z foronomie
Aritmetické hry a zábavy, GDML_Books, (1942), p. 42-48 / Harvested from
Access to full text
Full (PDF) 
@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/