1. A.A. Abrikosov, L. Gorkov, I.E. Dzyaloshinskyi, Methods of quantum field theory in statistical physics, Moscow 1962 (Engl, Pergamon London, 1965)
2. J.A. Barker, D. Henderson, Perturbation theory and EOS for fluids. J. Chem. Phys. 47, 2856 (1967)
3. N. Bessis, G. Bessis, G. Corbel, B. Dakhel, Bound state energies of the exponentially screened potentials. J. Chem. Phys. 63, 3744–3749 (1975)
4. S.T. Belyaev, Energy spectrum of a non-ideal Bose gas. JETP 7, 299 (1958)
5. E. Beth, G.E. Uhlenbeck, The quantum theory of the non-ideal gas II. Behaviour at low temperatures. Physica 4, 915–924 (1937)