@article{MAN_1952__125_160318,
     author = {H. Wittich},
     title = {Eindeutige {L\"osungen} der {Differentialgleichungen} w},
     journal = {Mathematische Annalen},
     pages = {355--365},
     publisher = {mathdoc},
     volume = {125},
     year = {1952},
     zbl = {0050.09001},
     url = {http://geodesic.mathdoc.fr/item/MAN_1952__125_160318/}
}