@article{DAN_1971_200_4_a0,
     author = {P. P. Belinskii},
     title = {On the order of approximation of quasi-conformal maps in space to conformal maps},
     journal = {Doklady Akademii Nauk},
     pages = {759--761},
     year = {1971},
     volume = {200},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1971_200_4_a0/}
}