TY  - JOUR
AU  - N. A. Shirokov
TI  - Division by an inner function does not change the class of smoothness
JO  - Doklady Akademii Nauk
PY  - 1983
SP  - 821
EP  - 823
VL  - 268
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1983_268_4_a11/
LA  - ru
ID  - DAN_1983_268_4_a11
ER  -