@article{UM_2009_17_2_a2,
     author = {Beran, Ladislav and Trch, Milan},
     title = {P\v{r}{\'\i}mka, kterou hled\'ate (1)},
     journal = {U\v{c}itel matematiky},
     pages = {81--85},
     year = {2009},
     volume = {17},
     number = {2},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/UM_2009_17_2_a2/}
}