@article{MAN_1906__62_158261,
     author = {David Hilbert},
     title = {Zur {Variationsrechnung}},
     journal = {Mathematische Annalen},
     pages = {351--370},
     publisher = {mathdoc},
     volume = {62},
     year = {1906},
     language = {de},
     url = {http://geodesic.mathdoc.fr/item/MAN_1906__62_158261/}
}