@article{MAN_1947__120_160136,
     author = {L.V. Ahlfors},
     title = {Das {Dirichletsche} {Prinzip}},
     journal = {Mathematische Annalen},
     pages = {36--42},
     publisher = {mathdoc},
     volume = {120},
     year = {1947},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/MAN_1947__120_160136/}
}