@article{UM_1994_2_3_a6,
     author = {Calda, Emil},
     title = {Subfaktori\'aly ve st\v{r}edo\v{s}kolsk\'e kombinatorice},
     journal = {U\v{c}itel matematiky},
     pages = {17--19},
     year = {1994},
     volume = {2},
     number = {3},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/UM_1994_2_3_a6/}
}