TY  - JOUR
TI  - Meetings of the Moscow Mathematical Society
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1997
SP  - 625
EP  - 630
VL  - 52
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_1997_52_3_a13/
LA  - en
ID  - RM_1997_52_3_a13
ER  -