@article{MZ_1955__62_169478,
     author = {Gerrit Bol},
     title = {Zur projektven {Theorie} der infinitesimalen {Fl\"achenverbiegung.}},
     journal = {Mathematische Zeitschrift},
     pages = {1--16},
     year = {1955},
     volume = {62},
     zbl = {0064.15801},
     url = {http://geodesic.mathdoc.fr/item/MZ_1955__62_169478/}
}