TY  - JOUR
AU  - G. S. Krechetov
TI  - Lyapunov functions for second-order autonomous systems of classes $5$--$7$
JO  - Differencialʹnye uravneniâ
PY  - 1984
SP  - 2048
EP  - 2053
VL  - 20
IS  - 12
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1984_20_12_a3/
LA  - ru
ID  - DE_1984_20_12_a3
ER  -