@article{MOMA_1961__65_177141,
     author = {Ludwig Hofmann},
     title = {Die {Stellung} der projektiven {Geometrie} im relativistischen {Weltbild.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {323--336},
     publisher = {mathdoc},
     volume = {65},
     year = {1961},
     zbl = {0098.42901},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1961__65_177141/}
}