%0 Journal Article
%A S. A. Nazarov
%T `Far interaction' of small spectral perturbations of the Neumann boundary conditions for an elliptic system of differential equations in a~three-dimensional domain
%J Sbornik. Mathematics
%D 2023
%P 58-107
%V 214
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SM_2023_214_1_a3/
%G en
%F SM_2023_214_1_a3