@article{IM_1991__105_3_143903,
     author = {Peter Li and Luen-fai Tam},
     title = {The heat equation and harmonic maps of complete manifolds.},
     journal = {Inventiones mathematicae},
     pages = {1--46},
     publisher = {mathdoc},
     volume = {105},
     number = {3},
     year = {1991},
     zbl = {0748.58006},
     url = {http://geodesic.mathdoc.fr/item/IM_1991__105_3_143903/}
}