TY  - JOUR
AU  - V. V. Nemytskii
AU  - Yu. V. Malyshev
TI  - A qualitative investigation of potential systems
JO  - Differencialʹnye uravneniâ
PY  - 1969
SP  - 1550
EP  - 1557
VL  - 5
IS  - 9
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1969_5_9_a1/
LA  - ru
ID  - DE_1969_5_9_a1
ER  -