TY  - JOUR
AU  - U. Engelmann
TI  - A problem with nonlocal boundary conditions for second order hyperbolic partial operator-differential equations
JO  - Differencialʹnye uravneniâ
PY  - 1975
SP  - 1687
EP  - 1693
VL  - 11
IS  - 9
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1975_11_9_a16/
LA  - ru
ID  - DE_1975_11_9_a16
ER  -