@article{10_21136_CPM_1953_117067,
     author = {Urban, Alois},
     title = {Druh\'y \'utvar k\v{r}ivosti plochy v $R_3$},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {73--88},
     publisher = {mathdoc},
     volume = {078},
     number = {1},
     year = {1953},
     doi = {10.21136/CPM.1953.117067},
     mrnumber = {0087134},
     zbl = {0090.12301},
     language = {cs},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1953.117067/}
}