TY  - JOUR
AU  - L. P. Shilnikov
TI  - Existence of a countable set of periodic motions in a four-dimensional space in an extended neighborhood of a saddle-focus
JO  - Doklady Akademii Nauk
PY  - 1967
SP  - 54
EP  - 57
VL  - 172
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1967_172_1_a13/
LA  - ru
ID  - DAN_1967_172_1_a13
ER  -