%0 Journal Article %A L. S. Pontryagin %A E. F. Mishchenko %T Some problems in the theory of differential equations with a~small parameter %J Informatics and Automation %D 1985 %P 99-118 %V 169 %I mathdoc %U http://geodesic.mathdoc.fr/item/TRSPY_1985_169_a6/ %G ru %F TRSPY_1985_169_a6