@article{CMFD_2019_65_1_a9,
     author = {S. M. Tashpulatov},
     title = {Spectra of the energy operator of three-electron systems in the impurity {Hubbard} model. {Second} doublet state},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {109--123},
     publisher = {mathdoc},
     volume = {65},
     number = {1},
     year = {2019},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2019_65_1_a9/}
}