@article{MAN_1922__85_158919,
     author = {H. Mohrmann},
     title = {Hilbertsche und {Beltramische} {Liniensysteme.} {Ein} {Beitrag} zur {Nicht-Desarguesschen} {Geometrie}},
     journal = {Mathematische Annalen},
     pages = {177--183},
     publisher = {mathdoc},
     volume = {85},
     year = {1922},
     url = {http://geodesic.mathdoc.fr/item/MAN_1922__85_158919/}
}