@article{10_21136_CPMF_1949_109145,
     author = {Havl{\'\i}\v{c}ek, Karel},
     title = {Sur les surfaces enveloppes de spheres},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky a fysiky},
     pages = {21--40},
     publisher = {mathdoc},
     volume = {74},
     number = {1},
     year = {1949},
     doi = {10.21136/CPMF.1949.109145},
     mrnumber = {0033137},
     zbl = {0033.02101},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPMF.1949.109145/}
}