@article{MAN_1879__15_156867,
     author = {Schur},
     title = {Geometrische {Untersuchungen} \"uber {Strahlencomplexe} ersten und zweiten {Grades}},
     journal = {Mathematische Annalen},
     pages = {432--464},
     publisher = {mathdoc},
     volume = {15},
     year = {1879},
     zbl = {11.0591.03},
     url = {http://geodesic.mathdoc.fr/item/MAN_1879__15_156867/}
}