@article{MZ_1937__42_168714,
     author = {E., D i g e l},
     title = {\"Uber die {Existenz} von {Integralen} der partiellen {Differentialgleichung} ............................... in der },
     journal = {Mathematische Zeitschrift},
     pages = {231--237},
     publisher = {mathdoc},
     volume = {42},
     year = {1937},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MZ_1937__42_168714/}
}