@article{ELMA_1974__29_141145,
     author = {Erwin Kreyszig},
     title = {\"Uber ein {System} partieller {Differentialgleichungen} und einen zugeh\"origen {Bergman-Operator.}},
     journal = {Elemente der Mathematik},
     pages = {105--112},
     publisher = {mathdoc},
     volume = {29},
     year = {1974},
     zbl = {0284.35011},
     url = {http://geodesic.mathdoc.fr/item/ELMA_1974__29_141145/}
}