TY - JOUR AU - Marina V. Deikalova AU - Anastasiya Yu. Torgashova TI - One-sided $L$-approximation on a sphere of the characteristic function of a layer JO - Ural mathematical journal PY - 2018 SP - 13 EP - 23 VL - 4 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/UMJ_2018_4_2_a2/ LA - en ID - UMJ_2018_4_2_a2 ER -