@article{UM_2005_13_3_a6,
     author = {Calda, Emil},
     title = {Nepo\v{r}\'adky},
     journal = {U\v{c}itel matematiky},
     pages = {170--173},
     year = {2005},
     volume = {13},
     number = {3},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/UM_2005_13_3_a6/}
}