TY  - JOUR
AU  - Yu. N. Bibikov
TI  - The stability of periodic motions in the transcendental case of two pure imaginary characteristic exponents
JO  - Doklady Akademii Nauk
PY  - 1970
SP  - 506
EP  - 509
VL  - 190
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DAN_1970_190_3_a3/
LA  - ru
ID  - DAN_1970_190_3_a3
ER  -