@article{MZ_1966__94_170619,
     author = {Reiner K\"uhnau},
     title = {Einige {Extremalprobleme} bei differentialgeometrischen und quasikonformen {Abbildungen.}},
     journal = {Mathematische Zeitschrift},
     pages = {178--192},
     publisher = {mathdoc},
     volume = {94},
     year = {1966},
     zbl = {0172.09904},
     url = {http://geodesic.mathdoc.fr/item/MZ_1966__94_170619/}
}