%0 Journal Article %A N. P. Morozov %T On the bounds for the application of the small parameter methods to the case of a single root of the amplitude equation %J Differencialʹnye uravneniâ %D 1988 %P 1273-1274 %V 24 %N 7 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1988_24_7_a25/ %G ru %F DE_1988_24_7_a25