@article{MZ_1974__140_172148,
     author = {J\"urgen Witte},
     title = {Ein {Eindeutigkeitssatz} f\"ur die {Differentialgleichung} y' = f (x, y).},
     journal = {Mathematische Zeitschrift},
     pages = {281--288},
     year = {1974},
     volume = {140},
     zbl = {0289.34007},
     url = {http://geodesic.mathdoc.fr/item/MZ_1974__140_172148/}
}