@article{MAN_1940__117_160035,
     author = {R. Mehmke},
     title = {Zur metrischen {Geometrie} quadratischer {Gebilde}},
     journal = {Mathematische Annalen},
     pages = {1--16},
     publisher = {mathdoc},
     volume = {117},
     year = {1940},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1940__117_160035/}
}