%0 Journal Article
%A V. S. Mokeichev
%T Perturbation theory in a nonselfadjoint special case
%J Issledovaniya po Prikladnoi Matematike i Informatike
%D 1992
%P 81-89
%V 19
%N 19
%U http://geodesic.mathdoc.fr/item/KUIPM_1992_19_19_a9/
%G ru
%F KUIPM_1992_19_19_a9