%0 Journal Article %A L. A. Kalyakin %T Asymptotic integration of a~perturbed hyperbolic system of equations in the class of conditionally periodic functions %J Trudy Moskovskogo matematičeskogo obŝestva %D 1986 %P 56-70 %V 49 %I mathdoc %U http://geodesic.mathdoc.fr/item/MMO_1986_49_a1/ %G ru %F MMO_1986_49_a1