TY  - JOUR
AU  - R. Sakamoto
TI  - Mixed problems for hyperbolic equations. I.~Energy inequalities
JO  - Matematika
PY  - 1972
SP  - 62
EP  - 80
VL  - 16
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MAT_1972_16_1_a2/
LA  - ru
ID  - MAT_1972_16_1_a2
ER  -