TY - JOUR AU - R. R. Salimov AU - E. A. Sevost'yanov TI - The theory of shell-based $Q$-mappings in geometric function theory JO - Sbornik. Mathematics PY - 2010 SP - 909 EP - 934 VL - 201 IS - 6 UR - http://geodesic.mathdoc.fr/item/SM_2010_201_6_a4/ LA - en ID - SM_2010_201_6_a4 ER -