%0 Journal Article %A D. K. Lika %A Yu. A. Ryabov %T Convergence of the small parameter method in the construction of periodic solutions of ordinary differential equations of neutral type with small lag %J Differencialʹnye uravneniâ %D 1972 %P 1977-1987 %V 8 %N 11 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1972_8_11_a8/ %G ru %F DE_1972_8_11_a8