TY  - JOUR
AU  - V. M. Savchin
TI  - On the structure of variational equations with symmetric operator $d/dt$
JO  - Differencialʹnye uravneniâ
PY  - 1993
SP  - 1765
EP  - 1771
VL  - 29
IS  - 10
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1993_29_10_a11/
LA  - ru
ID  - DE_1993_29_10_a11
ER  -