%0 Journal Article %A V. K. Romanko %T Unique solvability of boundary value problems for certain operator-differential equations %J Differencialʹnye uravneniâ %D 1977 %P 324-335 %V 13 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1977_13_2_a11/ %G ru %F DE_1977_13_2_a11