@article{MAN_1880__17_156918,
     author = {in Leipzig. Schur},
     title = {Zur {Theorie} der {Strahlencomplexe} zweiten {Grades}},
     journal = {Mathematische Annalen},
     pages = {107--109},
     year = {1880},
     volume = {17},
     zbl = {12.0620.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1880__17_156918/}
}