%0 Journal Article %A R. R. Salimov %A E. A. Sevost'yanov %T The theory of shell-based $Q$-mappings in geometric function theory %J Sbornik. Mathematics %D 2010 %P 909-934 %V 201 %N 6 %U http://geodesic.mathdoc.fr/item/SM_2010_201_6_a4/ %G en %F SM_2010_201_6_a4