TY  - JOUR
AU  - M. M. Zainulabidov
TI  - The Tricomi problem when the line of change of type of the equation is closed
JO  - Differencialʹnye uravneniâ
PY  - 1988
SP  - 177
EP  - 178
VL  - 24
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1988_24_1_a20/
LA  - ru
ID  - DE_1988_24_1_a20
ER  -