Geodesic
Structure of~the interaction amplitudes of~spin waves in~ferromagnets
Teoretičeskaâ i matematičeskaâ fizika, Tome 45 (1980) no. 1, pp. 114-121

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Conditions on the amplitudes of magnon interaction due to the exchange symmetry of the Hamiltonian are derived for the arbitrary ferromagnet. These conditions make it possible to find the asymptotical form of amplitudes of higher orders if the amplitudes of lower orders are known. 
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     author = {V. N. Krivoruchko and D. A. Yablonskii},
     title = {Structure of~the interaction amplitudes of~spin waves in~ferromagnets},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     publisher = {mathdoc},
     volume = {45},
     number = {1},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1980_45_1_a10/}
}
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V. N. Krivoruchko; D. A. Yablonskii. Structure of~the interaction amplitudes of~spin waves in~ferromagnets. Teoretičeskaâ i matematičeskaâ fizika, Tome 45 (1980) no. 1, pp. 114-121. http://geodesic.mathdoc.fr/item/TMF_1980_45_1_a10/