@article{MAN_1962__146_160942,
     author = {M. BREUER and J. W\"ULLENWEBER},
     title = {Existenz- und {Eindeutigkeitssatz} f\"ur {Integralmannigfaltigkeiten} involutiver {Vektorraumfelder.}},
     journal = {Mathematische Annalen},
     pages = {375--382},
     publisher = {mathdoc},
     volume = {146},
     year = {1962},
     zbl = {0112.14701},
     url = {http://geodesic.mathdoc.fr/item/MAN_1962__146_160942/}
}