@article{MZ_1929__29_168061,
     author = {Josef Lense},
     title = {\"Uber die {Tangentialr\"aume} ametrischer {Mannigfaltigkeiten}},
     journal = {Mathematische Zeitschrift},
     pages = {87--95},
     publisher = {mathdoc},
     volume = {29},
     year = {1929},
     zbl = {54.0789.02},
     url = {http://geodesic.mathdoc.fr/item/MZ_1929__29_168061/}
}