@inbook{403434,
title = {[Ob\'alka]},
booktitle = {Co v\'\i me o p\v rirozen\'ych \v c\'\i slech},
series = {GDML\_Books},
publisher = {Mlad\'a fronta},
address = {Praha},
year = {1961},
pages = {[i]-[ii]},
url = {http://dml.mathdoc.fr/item/403434}
}
(éd.). [Obálka], dans Co víme o přirozených číslech, GDML_Books, (1961), pp. [i]-[ii]. http://gdmltest.u-ga.fr/item/403434/