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Additional information
A. M. Gor'kii Perm State University. Translated from Teoreticheskaya i Matematicheskaya Fizika, Vol. 19, No. 2, pp. 269–274, May, 1974.
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Knyazev, A.R., Nepomnyashchii, Y.A. Spectrum of bose system with condensate near the threshold of decay into excitations with parallel momenta. Theor Math Phys 19, 504–508 (1974). https://doi.org/10.1007/BF01035951
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DOI: https://doi.org/10.1007/BF01035951