TY  - JOUR
TI  - Meetings of the Moscow Mathematical Society
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 2001
SP  - 189
EP  - 196
VL  - 56
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_2001_56_1_a22/
LA  - en
ID  - RM_2001_56_1_a22
ER  -