Geodesic
Hydrodynamic Hamiltonian for a nonideal Bose gas
Teoretičeskaâ i matematičeskaâ fizika, Tome 11 (1972) no. 2, pp. 236-247

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A functional integral method developed earlier is used to find the hydrodynamic Hamiltonian of a nonideal Bose gas and to construct a perturbation theory that is free of divergences at small energies and momenta. The kinetic equations at low temperatures are considered. The coefficient of first viscosity is calculated in quadratures. 
@article{TMF_1972_11_2_a10,
     author = {V. N. Popov},
     title = {Hydrodynamic {Hamiltonian} for a nonideal {Bose} gas},
     journal = {Teoreti\v{c}eska\^a i matemati\v{c}eska\^a fizika},
     pages = {236--247},
     publisher = {mathdoc},
     volume = {11},
     number = {2},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TMF_1972_11_2_a10/}
}
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V. N. Popov. Hydrodynamic Hamiltonian for a nonideal Bose gas. Teoretičeskaâ i matematičeskaâ fizika, Tome 11 (1972) no. 2, pp. 236-247. http://geodesic.mathdoc.fr/item/TMF_1972_11_2_a10/