%0 Journal Article %A A. V. Pereskokov %T Asymptotics of the~spectrum of a Hartree-type operator with a~screened Coulomb self-action potential near the~upper boundaries of spectral clusters %J Teoretičeskaâ i matematičeskaâ fizika %D 2021 %P 543-560 %V 209 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/TMF_2021_209_3_a8/ %G ru %F TMF_2021_209_3_a8