TY  - JOUR
TI  - Meetings of the St.~Petersburg Mathematical Society
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 2002
SP  - 827
EP  - 832
VL  - 57
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_2002_57_4_a18/
LA  - en
ID  - RM_2002_57_4_a18
ER  -