@article{MOMA_1959__63_177080,
     author = {Hans Hornich},
     title = {Zum {Existenzproblem} der linearen partiellen {Differentialgleichungen.}},
     journal = {Monatshefte f\"ur Mathematik},
     pages = {378--393},
     publisher = {mathdoc},
     volume = {63},
     year = {1959},
     zbl = {0093.09805},
     url = {http://geodesic.mathdoc.fr/item/MOMA_1959__63_177080/}
}