Geodesic
Spectrum of elementary excitations of a nonideal Bose gas
Teoretičeskaâ i matematičeskaâ fizika, Tome 4 (1970) no. 1, pp. 119-142 Cet article a éte moissonné depuis la source Math-Net.Ru

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A study is made of the spectrum of elementary excitations of a nonideal Bose gas at nonzero temperatures. Exprcsslons are obtained for the velocities and damping of first and secona sound at low temperatures and also the velocity and damping of ordinary sound in the neighborhood of the Bose condensation point. 
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     title = {Spectrum of elementary excitations of a~nonideal {Bose} gas},
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Yu. A. Tserkovnikov. Spectrum of elementary excitations of a nonideal Bose gas. Teoretičeskaâ i matematičeskaâ fizika, Tome 4 (1970) no. 1, pp. 119-142. http://geodesic.mathdoc.fr/item/TMF_1970_4_1_a12/

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