@article{GDZPPN00220066X,
title = {Rotationally symmetric harmonic maps from a ball into a sphere and the regularity problem for weak solutions of elliptic systems.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {341},
year = {1983},
pages = {146-161},
zbl = {0516.35032},
url = {http://dml.mathdoc.fr/item/GDZPPN00220066X}
}
Jäger, Willi; Kaul, Helmut. Rotationally symmetric harmonic maps from a ball into a sphere and the regularity problem for weak solutions of elliptic systems.. Journal für die reine und angewandte Mathematik, Tome 341 (1983) pp. 146-161. http://gdmltest.u-ga.fr/item/GDZPPN00220066X/