@article{IM_1992__108_2_143983,
     author = {Zhiren Jin},
     title = {Liouville theorems for harmonic maps.},
     journal = {Inventiones mathematicae},
     pages = {1--10},
     year = {1992},
     volume = {108},
     number = {2},
     zbl = {0768.53016},
     url = {http://geodesic.mathdoc.fr/item/IM_1992__108_2_143983/}
}