TY  - JOUR
AU  - V. P. Didenko
TI  - A variational problem for equations of mixed type
JO  - Differencialʹnye uravneniâ
PY  - 1977
SP  - 44
EP  - 49
VL  - 13
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1977_13_1_a6/
LA  - ru
ID  - DE_1977_13_1_a6
ER  -