@article{MAN_1929__101_159329,
     author = {P. Funk},
     title = {\"Uber {Geometrien,} bei denen die {Geraden} die {K\"urzesten} sind},
     journal = {Mathematische Annalen},
     pages = {226--237},
     publisher = {mathdoc},
     volume = {101},
     year = {1929},
     zbl = {55.1043.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1929__101_159329/}
}