@article{MZ_1993__213_1_174539,
     author = {P. Koskela and F. Reitich},
     title = {H\"older continuity of {Sobolev} functions and quasiconformal mappings.},
     journal = {Mathematische Zeitschrift},
     pages = {457--472},
     publisher = {mathdoc},
     volume = {213},
     number = {1},
     year = {1993},
     zbl = {0792.46023},
     url = {http://geodesic.mathdoc.fr/item/MZ_1993__213_1_174539/}
}