@article{MAN_1934__109_159668,
     author = {K. Friedrichs},
     title = {\"Uber ein {Minimumproblem} f\"ur {Potentialstr\"omungen} mit freiem {Rande}},
     journal = {Mathematische Annalen},
     pages = {60},
     publisher = {mathdoc},
     volume = {109},
     year = {1934},
     zbl = {0008.16605},
     language = {un},
     url = {https://geodesic-test.mathdoc.fr/item/MAN_1934__109_159668/}
}