TY  - JOUR
TI  - Meetings of the St. Petersburg Mathematical Society
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1997
VL  - 52
IS  - 2
UR  - http://geodesic.mathdoc.fr/item/RM_1997_52_2_a40/
LA  - ru
ID  - RM_1997_52_2_a40
ER  -