@article{GDZPPN00206443X,
title = {Ueber extremale quasikonforme Abbildungen.},
journal = {Commentarii mathematici Helvetici},
volume = {56},
year = {1981},
pages = {558-580},
zbl = {0504.30008},
url = {http://dml.mathdoc.fr/item/GDZPPN00206443X}
}
Fehlmann, Richard. Ueber extremale quasikonforme Abbildungen.. Commentarii mathematici Helvetici, Tome 56 (1981) pp. 558-580. http://gdmltest.u-ga.fr/item/GDZPPN00206443X/