@article{INTO_2023_229_a6,
     author = {S. M. Tashpulatov and R. T. Parmanova},
     title = {Structure of the essential spectrum and discrete spectrum of the energy operator of four-electron systems in the impurity {Hubbard} model. {The} third triplet state},
     journal = {Itogi nauki i tehniki. Sovremenna\^a matematika i e\"e prilo\v{z}eni\^a. Temati\v{c}eskie obzory},
     pages = {53--82},
     publisher = {mathdoc},
     volume = {229},
     year = {2023},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/INTO_2023_229_a6/}
}