TY  - JOUR
TI  - Meetings of Leningrad Mathematical Society
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1991
VL  - 46
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_1991_46_2_a17/
LA  - ru
ID  - RM_1991_46_2_a17
ER  -