@article{PMFA_1981_26_2_a1,
     author = {Kowalski, Old\v{r}ich},
     title = {O geometrii laplasi\'anu. {II}},
     journal = {Pokroky matematiky, fyziky a astronomie},
     pages = {69--81},
     year = {1981},
     volume = {26},
     number = {2},
     zbl = {0472.53047},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/item/PMFA_1981_26_2_a1/}
}