Для цитирования:

 ,   . Наносистемы: физика, химия, математика. 2020;11(2):138–144. https://doi.org/10.17586/2220-8054-2020-11-2-138-144

For citation:

Rasulov T.H., Dilmurodov E.B. Analysis of the spectrum of a 2×2 operator matrix. Discrete spectrum asymptotics. Nanosystems: Physics, Chemistry, Mathematics. 2020;11(2):138–144. https://doi.org/10.17586/2220-8054-2020-11-2-138-144