@article{NANO_2020_11_2_a1,
     author = {T. H. Rasulov and E. B. Dilmurodov},
     title = {Analysis of the spectrum of a $2\times 2$ operator matrix. {Discrete} spectrum asymptotics},
     journal = {Nanosistemy: fizika, himi\^a, matematika},
     pages = {138--144},
     publisher = {mathdoc},
     volume = {11},
     number = {2},
     year = {2020},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/NANO_2020_11_2_a1/}
}