@article{MZ_1929__30_168133,
     author = {L. Berwald},
     title = {\"Uber die n-dimensionalen {Geometrien} konstanter {Kr\"ummung} in denen die {Geraden} die k\"urzesten sind},
     journal = {Mathematische Zeitschrift},
     pages = {449--469},
     publisher = {mathdoc},
     volume = {30},
     year = {1929},
     zbl = {55.0405.14},
     url = {http://geodesic.mathdoc.fr/item/MZ_1929__30_168133/}
}