@article{CMUC_1965_6_2_a0,
     author = {Havel, V\'aclav},
     title = {Zur {Normalprojektion} von {Geradenb\"uscheln}},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {145--147},
     year = {1965},
     volume = {6},
     number = {2},
     mrnumber = {0187128},
     zbl = {0137.43303},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1965_6_2_a0/}
}