%0 Journal Article %A Willi Jäger %A Helmut Kaul %T Rotationally symmetric harmonic maps from a ball into a sphere and the regularity problem for weak solutions of elliptic systems. %J Journal für die reine und angewandte Mathematik %D 1983 %P 146-161 %V 343 %I mathdoc %U http://geodesic.mathdoc.fr/item/JRAM_1983__343_152552/ %F JRAM_1983__343_152552