Geodesic
Stability of the phonon branch of Bose spectrum of the superfluid Fermi system at large momenta
Zapiski Nauchnykh Seminarov POMI, Questions of quantum field theory and statistical physics. Part 4, Tome 131 (1983), pp. 114-117 Cet article a éte moissonné depuis la source Math-Net.Ru

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The phonon branch of Bose spectrum of superfluid Fermi system (Bogoliubov sound) is (investigated at $T=0$ It is shown, that every Bogoliubov sound quant (with arbitrary momentum) is stable and can not decay in several exitations with lower energy. 
@article{ZNSL_1983_131_a9,
     author = {V. A. Podolskii and V. N. Popov},
     title = {Stability of the phonon branch of {Bose} spectrum of the superfluid {Fermi} system at large momenta},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {114--117},
     year = {1983},
     volume = {131},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1983_131_a9/}
}
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V. A. Podolskii; V. N. Popov. Stability of the phonon branch of Bose spectrum of the superfluid Fermi system at large momenta. Zapiski Nauchnykh Seminarov POMI, Questions of quantum field theory and statistical physics. Part 4, Tome 131 (1983), pp. 114-117. http://geodesic.mathdoc.fr/item/ZNSL_1983_131_a9/