1. P.G. de Gennes, in
Superconductivity of metals and alloys
(W.A. Benjamin Inc.,
New York/Amsterdam,
1966), p. 96
2. F. Marsiglio,
J.E. Hirsch,
Phys. Rev. B 41, 6435
(1990)
3. A.J. Leggett, in
The physics of superconductors, Superconductivity on nanostructures, high-Tc and novel superconductors, organic superconductors, edited by
K.-H. Bennemann,
J.B. Ketterson
(Springer-Verlag,
Berlin, Heidelberg,
2004), Vol. 2, p. 1105
4. A.J. Leggett, in
Quantum liquids: Bose condensation and Cooper pairing in condensed-matter systems
(Oxford University Press,
New York,
2006), p. 190
5. F. Palestini,
G.C. Strinati,
Phys. Rev. B 89, 224508
(2014)