@article{JRAM_1969__238_183522,
     author = {Reiner K\"uhnau},
     title = {Quasikonforme {Abbildungen} und {Extremalprobleme} bei {Feldern} in inhomogenen {Medien.} {II.}},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {61--66},
     publisher = {mathdoc},
     volume = {238},
     year = {1969},
     zbl = {0195.09103},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1969__238_183522/}
}