@article{UM_1997_5_3_a7,
     author = {Ku\v{r}ina, Franti\v{s}ek},
     title = {Z rusk\'ych u\v{c}ebnic},
     journal = {U\v{c}itel matematiky},
     pages = {166--167},
     year = {1997},
     volume = {5},
     number = {3},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/UM_1997_5_3_a7/}
}