Geodesic
The ``slave boson'' method for the Hubbard model --
Zapiski Nauchnykh Seminarov POMI, Questions of quantum field theory and statistical physics. Part 8, Tome 169 (1988), pp. 68-75

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The modified “slave boson” method is applied to the description of the phase transitions metal-insulator and metal-superconductor in the Hubbard model. The formulaes for the energy gap and critical temperature are received. 
@article{ZNSL_1988_169_a7,
     author = {V. S. Kapitonov},
     title = {The ``slave boson'' method for the {Hubbard} model --},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {68--75},
     publisher = {mathdoc},
     volume = {169},
     year = {1988},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1988_169_a7/}
}
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V. S. Kapitonov. The ``slave boson'' method for the Hubbard model --. Zapiski Nauchnykh Seminarov POMI, Questions of quantum field theory and statistical physics. Part 8, Tome 169 (1988), pp. 68-75. http://geodesic.mathdoc.fr/item/ZNSL_1988_169_a7/