TY  - JOUR
TI  - Meetings of the St. Petersburg Mathematical Society
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1993
VL  - 48
IS  - 6
UR  - http://geodesic.mathdoc.fr/item/RM_1993_48_6_a24/
LA  - ru
ID  - RM_1993_48_6_a24
ER  -