%0 Journal Article %A B. M. Arkhipov %A A. Ya. Khokhryakov %T Strictly positive solutions of periodic systems of ordinary differential equations %J Differencialʹnye uravneniâ %D 1973 %P 1945-1955 %V 9 %N 11 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1973_9_11_a2/ %G ru %F DE_1973_9_11_a2