%0 Journal Article %A V. E. Balabaev %T Investigation of boundary value problems for canonical first-order systems %J Differencialʹnye uravneniâ %D 1993 %P 1358-1369 %V 29 %N 8 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1993_29_8_a9/ %G ru %F DE_1993_29_8_a9