TY - JOUR AU - M. Shirinbekov TI - On approximation of superharmonic functions in open sets JO - Sbornik. Mathematics PY - 1987 SP - 591 EP - 599 VL - 57 IS - 2 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/SM_1987_57_2_a16/ LA - en ID - SM_1987_57_2_a16 ER -