%0 Journal Article %A Nguen Tien Khiem %T Conditions for the existence of a stationary solution of the Fokker--Planck--Kolmogorov equation in amplitude and phase variables for nonlinear oscillatory systems %J Doklady Akademii Nauk %D 1992 %P 237-242 %V 322 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DAN_1992_322_2_a5/ %G ru %F DAN_1992_322_2_a5