%0 Journal Article
%A A. G. Eliseev
%A S. A. Lomov
%T The theory of singular perturbations in the case of spectral singularities of a~limit operator
%J Sbornik. Mathematics
%D 1988
%P 541-555
%V 59
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_1988_59_2_a16/
%G en
%F SM_1988_59_2_a16