Geodesic
Low-frequency asymptotics of the Green's functions of magnets with spontaneously broken symmetry
Teoretičeskaâ i matematičeskaâ fizika, Tome 89 (1991) no. 2, pp. 293-303

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The Hamiltonian approach is used to obtain dynamical equations of magnets with complete spontaneous breaking of the symmetry with respect to spin rotations in the external field. The two-time Green's functions and the spin-wave spectra in the hydrodynamic limit are found. 
@article{TMF_1991_89_2_a12,
     author = {M. Yu. Kovalevsky and A. L. Shishkin},
     title = {Low-frequency asymptotics of the {Green's} functions of magnets with spontaneously broken symmetry},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {293--303},
     publisher = {mathdoc},
     volume = {89},
     number = {2},
     year = {1991},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1991_89_2_a12/}
}
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M. Yu. Kovalevsky; A. L. Shishkin. Low-frequency asymptotics of the Green's functions of magnets with spontaneously broken symmetry. Teoretičeskaâ i matematičeskaâ fizika, Tome 89 (1991) no. 2, pp. 293-303. http://geodesic.mathdoc.fr/item/TMF_1991_89_2_a12/