TY  - JOUR
AU  - A. V. Bitsadze
TI  - On the theory of equations of mixed type
JO  - Differencialʹnye uravneniâ
PY  - 1970
SP  - 3
EP  - 6
VL  - 6
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1970_6_1_a0/
LA  - ru
ID  - DE_1970_6_1_a0
ER  -