%0 Journal Article %A S. M. Tashpulatov %T Structure of essential spectra and discrete spectrum of the energy operator of six-electron systems in the Hubbard model. Second singlet state %J Taurida Journal of Computer Science Theory and Mathematics %D 2023 %P 98-124 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/TVIM_2023_2_a6/ %G en %F TVIM_2023_2_a6