@article{UM_1994_2_4_a0,
     author = {Ku\v{r}ina, Franti\v{s}ek and Fuchs, Eduard and Novotn\'y, Jan},
     title = {T\v{r}ikr\'at o tvo\v{r}ivosti},
     journal = {U\v{c}itel matematiky},
     pages = {1--7},
     year = {1994},
     volume = {2},
     number = {4},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/UM_1994_2_4_a0/}
}