@article{EJDE_2000__2000__a70,
     author = {Zhang,  Kewei},
     title = {Some constancy results for harmonic maps from non-contractable domains into spheres},
     journal = {Electronic journal of differential equations},
     year = {2000},
     volume = {2000},
     zbl = {0958.58011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2000__2000__a70/}
}