TY  - JOUR
TI  - Meetings of the Leningrad Mathematical Society
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1989
VL  - 44
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_1989_44_6_a10/
LA  - ru
ID  - RM_1989_44_6_a10
ER  -