TY  - JOUR
AU  - S. E. Zhelezovsky
TI  - A dual variational principle for the wave equation
JO  - Differencialʹnye uravneniâ
PY  - 1992
SP  - 1033
EP  - 1039
VL  - 28
IS  - 6
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1992_28_6_a13/
LA  - ru
ID  - DE_1992_28_6_a13
ER  -