@article{MAN_1910__69_158474,
     author = {E. Holmgren},
     title = {Das {Dirichletsche} {Prinzip} und die {Theorie} der linearen {Integralgleichungen.}},
     journal = {Mathematische Annalen},
     pages = {498--513},
     publisher = {mathdoc},
     volume = {69},
     year = {1910},
     zbl = {41.0396.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1910__69_158474/}
}