Geodesic
Application of the spectral density method to systems with a~pair interaction
Teoretičeskaâ i matematičeskaâ fizika, Tome 5 (1970) no. 3, pp. 417-438

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The method of spectral densities is formulated and the simplest approximations are found for systems of Fermi or Bose particles with a pair interaction. The method is illustrated by the solution of the Hubbard model and a model “pair Hamiltonian”. The spectrum of a system of interacting bosons is investigated in the simplest approximation. 
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     author = {O. K. Kalashnikov and E. S. Fradkin},
     title = {Application of the spectral density method to systems with a~pair interaction},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {417--438},
     publisher = {mathdoc},
     volume = {5},
     number = {3},
     year = {1970},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1970_5_3_a8/}
}
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O. K. Kalashnikov; E. S. Fradkin. Application of the spectral density method to systems with a~pair interaction. Teoretičeskaâ i matematičeskaâ fizika, Tome 5 (1970) no. 3, pp. 417-438. http://geodesic.mathdoc.fr/item/TMF_1970_5_3_a8/