%0 Journal Article %A V. P. Serebryakov %T The number of solutions in the space $L_2$ of a nonselfadjoint system of second-order differential equations %J Vestnik Moskovskogo universiteta. Matematika, mehanika %D 1988 %P 3-8 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/VMUMM_1988_2_a0/ %G ru %F VMUMM_1988_2_a0