@article{SM_2010_201_6_a4,
     author = {R. R. Salimov and E. A. Sevost'yanov},
     title = {The theory of shell-based $Q$-mappings in geometric function theory},
     journal = {Sbornik. Mathematics},
     pages = {909--934},
     year = {2010},
     volume = {201},
     number = {6},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2010_201_6_a4/}
}