@article{MAN_1880__16_156899,
     author = {Bachmann},
     title = {Erg\"anzung einer {Untersuchung} von {Dirichlet}},
     journal = {Mathematische Annalen},
     pages = {537--549},
     year = {1880},
     volume = {16},
     url = {http://geodesic.mathdoc.fr/item/MAN_1880__16_156899/}
}