@article{MAN_1916__77_158721,
     author = {L. Bieberbach},
     title = {\"Uber einige {Extremalprobleme} im {Gebiete} der konformen {Abbildung}},
     journal = {Mathematische Annalen},
     pages = {153--172},
     publisher = {mathdoc},
     volume = {77},
     year = {1916},
     zbl = {46.0549.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1916__77_158721/}
}