@article{RMF_2022_97_1_a1,
     author = {Jan\v{c}a\v{r}{\'\i}k, Anton{\'\i}n and Kepka, Tom\'a\v{s} and Voln\'y, Ivan},
     title = {Beznul\'a \v{c}{\'\i}sla},
     journal = {Rozhledy matematicko-fyzik\'aln{\'\i}},
     pages = {13--18},
     year = {2022},
     volume = {97},
     number = {1},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/RMF_2022_97_1_a1/}
}