@article{DAN_1976_230_5_a2,
     author = {A. P. Kopylov},
     title = {Ahlfors problem on the continuation of quasi-conformal mappings and the quasi-conformal equivalence domains to a ball},
     journal = {Doklady Akademii Nauk},
     pages = {1025--1028},
     publisher = {mathdoc},
     volume = {230},
     number = {5},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1976_230_5_a2/}
}