TY  - JOUR
TI  - Letter to the editor
JO  - Sbornik. Mathematics
PY  - 1982
VL  - 43
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1982_43_3_a2/
LA  - en
ID  - SM_1982_43_3_a2
ER  -