@article{MZ_1949__51_169103,
     author = {G. N\"obeling},
     title = {\"Uber die erste {Randwertaufgabe} bei regul\"aren {Variationsproplemen.} {I}},
     journal = {Mathematische Zeitschrift},
     pages = {712--751},
     publisher = {mathdoc},
     volume = {51},
     year = {1949},
     zbl = {0035.06604},
     url = {http://geodesic.mathdoc.fr/item/MZ_1949__51_169103/}
}