TY  - JOUR
TI  - Meetings of the St.~Petersburg Mathematical Society
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 2008
SP  - 397
EP  - 403
VL  - 63
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_2008_63_2_a19/
LA  - en
ID  - RM_2008_63_2_a19
ER  -