@article{10_21136_CPMF_1938_109455,
     author = {Posp{\'\i}\v{s}il, Bed\v{r}ich},
     title = {Sur le nombre des topologies d'un ensemble donn\'e},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky a fysiky},
     pages = {100--102},
     year = {1938},
     volume = {67},
     number = {2},
     doi = {10.21136/CPMF.1938.109455},
     zbl = {0018.27701},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPMF.1938.109455/}
}