@article{JRAM_1987__377_152922,
     author = {Atsushi Tachikawa},
     title = {A regularity theorem for harmonic mappings.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {1--11},
     publisher = {mathdoc},
     volume = {377},
     year = {1987},
     zbl = {0607.58010},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1987__377_152922/}
}