Geodesic
Exact asymptotic methods in the band theory of magnetism
Teoretičeskaâ i matematičeskaâ fizika, Tome 24 (1975) no. 3, pp. 419-424

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The model hamiltonian, describing the exchange interaction as well as the Coulomb interection is considered. The mazoration method by N. N. Bogoliubov (Jr.) is used. On the base the approximate hamiltonian, which is equivalent to the initial one the system of the nonlinear integral equations for the order parameter is obtained and discussed. 
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     author = {B. V. Moshchinskii and V. K. Fedyanin},
     title = {Exact asymptotic methods in the band theory of magnetism},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     publisher = {mathdoc},
     volume = {24},
     number = {3},
     year = {1975},
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     url = {http://geodesic.mathdoc.fr/item/TMF_1975_24_3_a13/}
}
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B. V. Moshchinskii; V. K. Fedyanin. Exact asymptotic methods in the band theory of magnetism. Teoretičeskaâ i matematičeskaâ fizika, Tome 24 (1975) no. 3, pp. 419-424. http://geodesic.mathdoc.fr/item/TMF_1975_24_3_a13/