%0 Journal Article %A O. Martio %T On the Integrability of the Derivative of a Quasiregular Mapping. %J Mathematica Scandinavica %D 1974 %P 43-48 %V 35 %I mathdoc %U http://geodesic.mathdoc.fr/item/MS2_1974__35_166373/ %F MS2_1974__35_166373