@article{MAN_1904__59_158152,
     author = {David Hilbert},
     title = {\"Uber das {Dirichletsche} {Prinzip}},
     journal = {Mathematische Annalen},
     pages = {161--186},
     publisher = {mathdoc},
     volume = {59},
     year = {1904},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1904__59_158152/}
}