TY  - JOUR
TI  - Meetings of the Moscow Mathematical Society
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1998
SP  - 413
EP  - 417
VL  - 53
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_1998_53_2_a19/
LA  - en
ID  - RM_1998_53_2_a19
ER  -