%0 Journal Article %A M. I. Alekseenko %A A. Ya. Khokhryakov %T A function of the boundary value conditions and estimation of the Green's function of a periodic problem %J Differencialʹnye uravneniâ %D 1971 %P 1158-1170 %V 7 %N 7 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1971_7_7_a1/ %G ru %F DE_1971_7_7_a1