1. J. R. Schrieffer: Theory of Superconductivity (Preseus books, Reading, MA, 1983)
2. W. L. MacMillan and J. M. Rowell: Tnneling and Strong-Coupling Superconductivity. In: Superconductivity, ed by R. D. Parks (Dekker, New York, 1969), Vol. 1, Sec. V.
3. For an extensive review on conventional superconductor, see. J. P. Carbotte: Rev. Mod. Phys. 62, 1027 (1990)
4. P. W. Anderson: The Theory of Superconductivity in the High-T
c
Cuprates (Princeton University Press, Princeton, New Jersey, 1997)
5. B. H. Brandow: Phil. Mag. 1, 2487 (2003)