@misc{PMFA_1994_39_3_a1,
     title = {[Obrazov\'a p\v{r}{\'\i}loha k \v{c}l\'anku {Sjezd} {Jednoty} \v{c}esk\'ych matematik\r{u} a fyzik\r{u}]},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {139--142},
     year = {1994},
     volume = {39},
     number = {3},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1994_39_3_a1/}
}