@article{MAN_1923__89_158994,
     author = {K. L\"owner},
     title = {Untersuchungen \"uber schlichte konforme {Abbildungen} des {Einheitskreises.} {I.}},
     journal = {Mathematische Annalen},
     pages = {103--121},
     publisher = {mathdoc},
     volume = {89},
     year = {1923},
     zbl = {49.0714.01},
     url = {http://geodesic.mathdoc.fr/item/MAN_1923__89_158994/}
}