TY  - JOUR
AU  - A. B. Mitel'man
TI  - The absence of weak lacunae between ovals of the characteristic surface of a~hyperbolic operator
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1972
VL  - 27
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_1972_27_6_a15/
LA  - ru
ID  - RM_1972_27_6_a15
ER  -