@article{MZ_1951__54_169210,
     author = {Wilhelm Klingenberg},
     title = {Zur affinen {Differentialgeometrie} {I.}},
     journal = {Mathematische Zeitschrift},
     pages = {65--80},
     year = {1951},
     volume = {54},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MZ_1951__54_169210/}
}