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

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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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     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1974},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1974_19_2_a11/}
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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/