%0 Journal Article
%A T. H. Rasulov
%A N. A. Tosheva
%T Analytic description of the essential spectrum of a family of $3\times 3$ operator matrices
%J Nanosistemy: fizika, himiâ, matematika
%D 2019
%P 511-519
%V 10
%N 5
%I mathdoc
%U http://geodesic.mathdoc.fr/item/NANO_2019_10_5_a1/
%G en
%F NANO_2019_10_5_a1