TY  - JOUR
AU  - V. L. Ginzburg
TI  - On~closed characteristics of 2-forms
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1988
SP  - 225
EP  - 226
VL  - 43
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_1988_43_5_a15/
LA  - en
ID  - RM_1988_43_5_a15
ER  -