TY  - JOUR
AU  - T. I. Lanina
TI  - Certain problems for equations of hyperbolic and mixed types
JO  - Differencialʹnye uravneniâ
PY  - 1973
SP  - 115
EP  - 122
VL  - 9
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1973_9_1_a11/
LA  - ru
ID  - DE_1973_9_1_a11
ER  -