@article{PMFA_1981_26_1_a1,
     author = {Kowalski, Old\v{r}ich},
     title = {O geometrii laplasi\'anu. {I}},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {23--41},
     year = {1981},
     volume = {26},
     number = {1},
     mrnumber = {0617534},
     zbl = {0472.53046},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1981_26_1_a1/}
}