@article{PMFA_1956_1_4_a7,
     author = {Marek, Ji\v{r}{\'\i}},
     title = {St\'a\v{r}{\'\i} {Zem\v{e},} ur\v{c}en\'e z pom\v{e}rn\'eho mno\v{z}stv{\'\i} p\v{r}irozen\'ych isotop\r{u}},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {385--396},
     year = {1956},
     volume = {1},
     number = {4},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1956_1_4_a7/}
}