@article{CMH_1982__57_139919,
     author = {Li Zhong},
     title = {On the existence of extremal {Teichm\"uller} mappings.},
     journal = {Commentarii mathematici Helvetici},
     pages = {511--518},
     year = {1982},
     volume = {57},
     zbl = {0526.30030},
     url = {http://geodesic.mathdoc.fr/item/CMH_1982__57_139919/}
}