Geodesic
Uniqueness of extremal quasiconformal mappings of Teichmüller type
Matematičeskie zametki, Tome 16 (1974) no. 2, pp. 213-220 
V. G. Sheretov. Uniqueness of extremal quasiconformal mappings of Teichmüller type. Matematičeskie zametki, Tome 16 (1974) no. 2, pp. 213-220. http://geodesic.mathdoc.fr/item/MZM_1974_16_2_a3/
@article{MZM_1974_16_2_a3,
     author = {V. G. Sheretov},
     title = {Uniqueness of extremal quasiconformal mappings of {Teichm\"uller} type},
     journal = {Matemati\v{c}eskie zametki},
     pages = {213--220},
     year = {1974},
     volume = {16},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1974_16_2_a3/}
}
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Voir la notice de l'article provenant de la source Math-Net.Ru

We prove a theorem concerning the uniqueness of extremal quasiconformal mappings, generalizing thereby a well-known theorem of Teichmüller.