@article{DAN_1974_219_6_a13,
     author = {V. V. Savin},
     title = {On a mapping of a ball in space},
     journal = {Doklady Akademii Nauk},
     pages = {1328--1329},
     year = {1974},
     volume = {219},
     number = {6},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1974_219_6_a13/}
}