@article{MAN_1988__282_2_164471,
     author = {O. Martio and J. V\"ais\"al\"a},
     title = {Elliptic {Equations} and {Maps} of {Bounded} {Length} {Disortion.}},
     journal = {Mathematische Annalen},
     pages = {423--444},
     publisher = {mathdoc},
     volume = {282},
     number = {2},
     year = {1988},
     zbl = {0632.35021},
     url = {http://geodesic.mathdoc.fr/item/MAN_1988__282_2_164471/}
}