TY  - JOUR
AU  - V. G. Romanovsky
TI  - On the calculation of Lyapunov quantities in the case of two purely imaginary roots
JO  - Differencialʹnye uravneniâ
PY  - 1993
SP  - 910
EP  - 912
VL  - 29
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/DE_1993_29_5_a23/
LA  - ru
ID  - DE_1993_29_5_a23
ER  -