%0 Journal Article %A N. I. Yatskin %T The periodic solutions of linear equations in differential forms %J Differencialʹnye uravneniâ %D 1975 %P 1607-1619 %V 11 %N 9 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1975_11_9_a8/ %G ru %F DE_1975_11_9_a8