TY  - JOUR
AU  - I. M. Koval'chik
TI  - A~differential-variational equation
JO  - Trudy Matematicheskogo Instituta imeni V.A. Steklova
PY  - 1966
VL  - 21
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/RM_1966_21_5_a20/
LA  - ru
ID  - RM_1966_21_5_a20
ER  -