TY - JOUR AU - A. V. Pereskokov TI - Asymptotics of the~spectrum of a Hartree-type operator with a~screened Coulomb self-action potential near the~upper boundaries of spectral clusters JO - Teoretičeskaâ i matematičeskaâ fizika PY - 2021 SP - 543 EP - 560 VL - 209 IS - 3 PB - mathdoc UR - http://geodesic.mathdoc.fr/item/TMF_2021_209_3_a8/ LA - ru ID - TMF_2021_209_3_a8 ER -