TY  - JOUR
AU  - V. K. Romanko
TI  - Systems with first order derivative in the ``time''
JO  - Differencialʹnye uravneniâ
PY  - 1969
SP  - 174
EP  - 185
VL  - 5
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1969_5_1_a13/
LA  - ru
ID  - DE_1969_5_1_a13
ER  -