TY  - JOUR
AU  - G. U. Matevosyan
TI  - Analogs of the $N\{\omega\}$ classes in the case of a~circular annulus
JO  - Matematičeskie zametki
PY  - 1977
SP  - 173
EP  - 182
VL  - 21
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZM_1977_21_2_a4/
LA  - ru
ID  - MZM_1977_21_2_a4
ER  -