Geodesic
On a~possibility of using generalized Okubo operators to take into account correlations in the Hubbard model with degeneracy
Teoretičeskaâ i matematičeskaâ fizika, Tome 64 (1985) no. 1, pp. 163-170

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The two-orbital Hubbard modet with degeneracy and isotropic hopping integrals is considered. A systematic method is proposed for taking into account iutra-atomic correlations of the electrons by means of generalized Okubo tensor operators. The spectrum of electron excitations in a very simple case is calculated as an example. 
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     author = {A. V. Vedyaev and V. A. Ivanov and V. E. Shilov},
     title = {On a~possibility of using generalized {Okubo} operators to take into account correlations in the {Hubbard} model with degeneracy},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {163--170},
     publisher = {mathdoc},
     volume = {64},
     number = {1},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1985_64_1_a13/}
}
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A. V. Vedyaev; V. A. Ivanov; V. E. Shilov. On a~possibility of using generalized Okubo operators to take into account correlations in the Hubbard model with degeneracy. Teoretičeskaâ i matematičeskaâ fizika, Tome 64 (1985) no. 1, pp. 163-170. http://geodesic.mathdoc.fr/item/TMF_1985_64_1_a13/