Geodesic
Spectra of the energy operator of three-electron systems in the impurity Hubbard model. Second doublet state
Contemporary Mathematics. Fundamental Directions, Contemporary problems in mathematics and physics, Tome 65 (2019) no. 1, pp. 109-123.

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We consider the three-electron systems in the impurity Hubbard model and investigated the spectra of the system in the second doublet state in the $\nu$-dimensional lattice $Z^{\nu}$. 
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S. M. Tashpulatov. Spectra of the energy operator of three-electron systems in the impurity Hubbard model. Second doublet state. Contemporary Mathematics. Fundamental Directions, Contemporary problems in mathematics and physics, Tome 65 (2019) no. 1, pp. 109-123. http://geodesic.mathdoc.fr/item/CMFD_2019_65_1_a9/

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