%0 Journal Article %A G. V. Ždanova %A M. V. Fedoryuk %T Asymptotic theory of systems of ordinary second order differential equations, and the scattering problem %J Trudy Moskovskogo matematičeskogo obŝestva %D 1977 %P 213-242 %V 34 %I mathdoc %U http://geodesic.mathdoc.fr/item/MMO_1977_34_a6/ %G ru %F MMO_1977_34_a6