@article{MAN_1891__39_157566,
     author = {Fr. Schur},
     title = {Ueber die {Einf\"uhrung} der sogenannten idealen {Elemente} in die projective {Geometrie.}},
     journal = {Mathematische Annalen},
     pages = {113--124},
     publisher = {mathdoc},
     volume = {39},
     year = {1891},
     zbl = {23.0638.04},
     url = {http://geodesic.mathdoc.fr/item/MAN_1891__39_157566/}
}