TY  - JOUR
AU  - N. G. Sorokina
TI  - Energy relations for multidimensional equations of mixed type
JO  - Differencialʹnye uravneniâ
PY  - 1973
SP  - 158
EP  - 161
VL  - 9
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1973_9_1_a17/
LA  - ru
ID  - DE_1973_9_1_a17
ER  -