%0 Journal Article %A V. I. Mironenko %T A method that allows one to determine the initial data of periodic solutions of differential systems and to compare the mappings for a period %J Differencialʹnye uravneniâ %D 1980 %P 1985-1994 %V 16 %N 11 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1980_16_11_a8/ %G ru %F DE_1980_16_11_a8