%0 Journal Article %A V. P. Derevenskii %T Solvability in quadratures of second-order matrix differential equations %J Differencialʹnye uravneniâ %D 1991 %P 901-904 %V 27 %N 5 %I mathdoc %U http://geodesic.mathdoc.fr/item/DE_1991_27_5_a21/ %G ru %F DE_1991_27_5_a21