@article{MZ_1960__74_169889,
     author = {Hartmut Ehlich},
     title = {\"Uber zwei {Randwertaufgaben} f\"ur nichtlineare {Differentialgleichungssysteme.}},
     journal = {Mathematische Zeitschrift},
     pages = {302--318},
     publisher = {mathdoc},
     volume = {74},
     year = {1960},
     zbl = {0093.27803},
     url = {http://geodesic.mathdoc.fr/item/MZ_1960__74_169889/}
}