Geodesic
Spin-wave spectra and Green's functions in two-sublattice spiral magnets
Teoretičeskaâ i matematičeskaâ fizika, Tome 87 (1991) no. 2, pp. 274-282

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Bogolyubov's method of quasiaverages and the reduced-description hypothesis are used to consider the thermodynamics and kinetics of spiral magnets with two equivalent sublatticeso Expressions are obtained for the spin-wave spectra and Green's functions in the quasiparticle and “hydrodynamic” approximations. 
@article{TMF_1991_87_2_a8,
     author = {M. Yu. Kovalevsky and A. A. Rozhkov},
     title = {Spin-wave spectra and {Green's} functions in two-sublattice spiral magnets},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {274--282},
     publisher = {mathdoc},
     volume = {87},
     number = {2},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1991_87_2_a8/}
}
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M. Yu. Kovalevsky; A. A. Rozhkov. Spin-wave spectra and Green's functions in two-sublattice spiral magnets. Teoretičeskaâ i matematičeskaâ fizika, Tome 87 (1991) no. 2, pp. 274-282. http://geodesic.mathdoc.fr/item/TMF_1991_87_2_a8/