@article{MAN_1941__118_160109,
     author = {A. Schmidt},
     title = {Die {Dualit\"at} von {Inzidenz} und {Senkrechtstehen} in der absoluten {Geometrie}},
     journal = {Mathematische Annalen},
     pages = {609--625},
     publisher = {mathdoc},
     volume = {118},
     year = {1941},
     zbl = {0027.41801},
     url = {http://geodesic.mathdoc.fr/item/MAN_1941__118_160109/}
}