@article{CMH_1986__61_140060,
     author = {Raimo N\"akki and Bruce Palka},
     title = {Extremal length and {H\"older} continuity of conformal mappings.},
     journal = {Commentarii mathematici Helvetici},
     pages = {389--414},
     publisher = {mathdoc},
     volume = {61},
     year = {1986},
     zbl = {0597.30011},
     url = {http://geodesic.mathdoc.fr/item/CMH_1986__61_140060/}
}