%0 Journal Article %A Yu. N. Bibikov %T Stability of Zero Solutions of Essentially Nonlinear One-Degree-of-Freedom Hamiltonian and Reversible Systems %J Differencialʹnye uravneniâ %D 2002 %P 579-584 %V 38 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_2002_38_5_a0/ %G ru %F DE_2002_38_5_a0