%0 Journal Article
%A A. G. Baskakov
%T A~theorem on splitting an operator, and some related questions in the analytic theory of perturbations
%J Izvestiya. Mathematics 
%D 1987
%P 421-444
%V 28
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/IM2_1987_28_3_a0/
%G en
%F IM2_1987_28_3_a0