@article{MM2_1991__70_1_155582,
     author = {Fr\'ederic H\'elein},
     title = {Regularity of weakly harmonic maps from a surface into a manifold with symmetries.},
     journal = {Manuscripta mathematica},
     pages = {203--218},
     publisher = {mathdoc},
     volume = {70},
     number = {1},
     year = {1991},
     zbl = {0718.58019},
     url = {http://geodesic.mathdoc.fr/item/MM2_1991__70_1_155582/}
}