@article{10_21136_AM_1974_103512,
     author = {Fi\v{r}t, Vladim{\'\i}r},
     title = {Surfaces of characteristic curvature},
     journal = {Applications of Mathematics},
     pages = {36--48},
     publisher = {mathdoc},
     volume = {19},
     number = {1},
     year = {1974},
     doi = {10.21136/AM.1974.103512},
     mrnumber = {0341291},
     zbl = {0282.53004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/AM.1974.103512/}
}