@article{MAN_1960__140_160758,
     author = {F. BACHMANN and W. PEJAS},
     title = {Metrische {Teilebenen} hyperbolischer projektiv-metrischer {Ebenen.}},
     journal = {Mathematische Annalen},
     pages = {1--8},
     publisher = {mathdoc},
     volume = {140},
     year = {1960},
     zbl = {0096.15103},
     url = {http://geodesic.mathdoc.fr/item/MAN_1960__140_160758/}
}