TY  - JOUR
AU  - V. N. Vragov
TI  - Some boundary value problems for a certain class of equations of mixed type in the three-dimensional case
JO  - Differencialʹnye uravneniâ
PY  - 1975
SP  - 27
EP  - 32
VL  - 11
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1975_11_1_a3/
LA  - ru
ID  - DE_1975_11_1_a3
ER  -