%0 Journal Article %A S. M. Tashpulatov %T The Structure of the Essential Spectrum and the Discrete Spectrum of the Energy Operator for Six-Electron Systems in the Hubbard Model. The Second Singlet State %J Trudy Instituta matematiki i mehaniki %D 2023 %P 210-230 %V 29 %N 3 %U http://geodesic.mathdoc.fr/item/TIMM_2023_29_3_a12/ %G ru %F TIMM_2023_29_3_a12