@article{MAN_1931__105_159517,
     author = {H. Schmidt},
     title = {\"Uber multiplikative {Funktionen} und die daraus entspringenden {Differentialsysteme}},
     journal = {Mathematische Annalen},
     pages = {325--380},
     publisher = {mathdoc},
     volume = {105},
     year = {1931},
     zbl = {57.0449.02},
     url = {http://geodesic.mathdoc.fr/item/MAN_1931__105_159517/}
}