1. M. Barranco, J.R. Buchler, Phys. Rev. C 22, 1729 (1980).
2. L.D. Landau, Sov. Phys. JETP 5, 101 (1957).
3. A.B. Migdal, Theory of finite Fermi systems and applications to atomic nuclei (Wiley & Sons, N.Y., 1967).
4. G. Baym, C.J. Pethick, in The Physics of Liquid and Solid Helium, edited by K.H. Bennemann, J.B. Ketterson, Vol. 2 (Wiley, New-York, 1978) p. 1.
5. C.J. Pethick, D.G. Ravenhall, Ann. Phys. (N.Y.) 183, 131 (1988).