@article{DAN_1977_234_4_a1,
     author = {A. K. Varisov},
     title = {On the extension of quasi-conformal space mappings},
     journal = {Doklady Akademii Nauk},
     pages = {740--742},
     year = {1977},
     volume = {234},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1977_234_4_a1/}
}