Geodesic
Spectrum of bose system with condensate near the threshold of decay into excitations with parallel momenta
Teoretičeskaâ i matematičeskaâ fizika, Tome 19 (1974) no. 2, pp. 269-274 Cet article a éte moissonné depuis la source Math-Net.Ru

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An investigation is made of the nature of the continuation of the one-particle spectrum of a Bose system with condensate beyond the threshold of the decay into excitations with parallel momenta. 
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     author = {A. R. Knyazev and Yu. A. Nepomnyashchii},
     title = {Spectrum of bose system with condensate near the threshold of decay into excitations with parallel momenta},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
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     year = {1974},
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A. R. Knyazev; Yu. A. Nepomnyashchii. Spectrum of bose system with condensate near the threshold of decay into excitations with parallel momenta. Teoretičeskaâ i matematičeskaâ fizika, Tome 19 (1974) no. 2, pp. 269-274. http://geodesic.mathdoc.fr/item/TMF_1974_19_2_a11/

[1] L. P. Pitaevskii, ZhETF, 36 (1959), 1169

[2] Yu. A. Nepomnyaschii, A. A. Nepomnyaschii, ZhETF, 65 (1973), 271

[3] D. A. Kirzhnits, Yu. A. Nepomnyaschii, ZhETF, 59 (1970), 2203; Ю. А. Непомнящий, ТМФ, 8 (1971), 413 ; Ю. А. Непомнящий, А. А. Непомнящий, ТМФ, 9 (1971), 137