%0 Journal Article %A V. N. Bobochko %T The de la Vall\'ee-Poussin problem for a~system of singularly perturbed differential equations with unstable spectrum %J Izvestiâ vysših učebnyh zavedenij. Matematika %D 1988 %P 15-24 %N 6 %I mathdoc %U http://geodesic.mathdoc.fr/item/IVM_1988_6_a2/ %G ru %F IVM_1988_6_a2