@article{MZ_1918__1_167452,
     author = {J., H\"orn},
     title = {Zur {Theorie} der nichtlinearen {Differenzengleichungen}},
     journal = {Mathematische Zeitschrift},
     pages = {80--114},
     publisher = {mathdoc},
     volume = {1},
     year = {1918},
     zbl = {46.0709.02},
     url = {http://geodesic.mathdoc.fr/item/MZ_1918__1_167452/}
}