@article{MZ_1954__61_169466,
     author = {Johannes Nitsche},
     title = {\"Uber die linearen {Randwertprobleme} eines quasilinearen elliptischen {Differentialgleichungssystems.}},
     journal = {Mathematische Zeitschrift},
     pages = {336--347},
     publisher = {mathdoc},
     volume = {61},
     year = {1954},
     zbl = {0058.32401},
     url = {http://geodesic.mathdoc.fr/item/MZ_1954__61_169466/}
}