@article{MAN_1932__106_159550,
     author = {H. Busemann},
     title = {\"Uber die {Geometrien,} in denen die {Kreise} mit unendlichem {Radius}},
     journal = {Mathematische Annalen},
     pages = {CXL--CLX},
     publisher = {mathdoc},
     volume = {106},
     year = {1932},
     zbl = {58.0602.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1932__106_159550/}
}