@article{IM_1978__44_142531,
     author = {Shing-Tung Yau and Richard Schoen},
     title = {On {Univalent} {Harmonic} {Maps} {Between} {Surfaces.}},
     journal = {Inventiones mathematicae},
     pages = {265--278},
     publisher = {mathdoc},
     volume = {44},
     year = {1978},
     zbl = {0388.58005},
     url = {http://geodesic.mathdoc.fr/item/IM_1978__44_142531/}
}