TY  - JOUR
AU  - Wintner, Aurel
TI  - On an instability criterion of Liapounoff
JO  - Portugaliae mathematica
PY  - 1956
SP  - 13
EP  - 18
VL  - 15
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/PORMA_1956__15_1_114763/
LA  - en
ID  - PORMA_1956__15_1_114763
ER  -