@article{UM_2001_9_2_a5,
     author = {Zelinka, Bohdan},
     title = {Kolik zelen\'ych l{\'\i}stk\r{u} m\'a jedle aneb {Jak} s\v{c}{\'\i}tat a n\'asobit p\v{r}es pr\'azdnou mno\v{z}inu},
     journal = {U\v{c}itel matematiky},
     pages = {106--110},
     year = {2001},
     volume = {9},
     number = {2},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/UM_2001_9_2_a5/}
}