%0 Journal Article
%A S. A. Stepin
%A V. V. Fufaev
%T The phase-integral method in a~problem of singular perturbation theory
%J Izvestiya. Mathematics 
%D 2017
%P 359-390
%V 81
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM2_2017_81_2_a5/
%G en
%F IM2_2017_81_2_a5