TY  - JOUR
AU  - O. A. Oleinik
TI  - On second order hyperbolic equations degenerating in the interior of a~region and on its boundary
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1969
VL  - 24
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_1969_24_2_a12/
LA  - ru
ID  - RM_1969_24_2_a12
ER  -