TY  - JOUR
AU  - L. D. Pustyl'nikov
TI  - Stable and oscillating motions in nonautonomous dynamical systems. A~generalization of C.\,L.~Siegel's theorem to the nonautonomous case
JO  - Sbornik. Mathematics
PY  - 1974
SP  - 382
EP  - 404
VL  - 23
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/SM_1974_23_3_a3/
LA  - en
ID  - SM_1974_23_3_a3
ER  -