@article{CMH_1964__39_139282,
     author = {Kurt Strebel},
     title = {Zur {Frage} der {Eindeutigkeit} extremaler quasikonformer {Abbildungen} des {Einheitskreises} {II.}},
     journal = {Commentarii mathematici Helvetici},
     pages = {77--89},
     publisher = {mathdoc},
     volume = {39},
     year = {1964},
     zbl = {0147.07202},
     url = {http://geodesic.mathdoc.fr/item/CMH_1964__39_139282/}
}