1. For an excellent review and references, see S. Coleman’s 1973 Erice Lectures Secret Symmetry, reprinted in S. Coleman, Aspects of Symmetry, Cambridge University Press, Cambridge, 1985
2. S. Weinberg, The Quantum Theory of Fields, vol. II, Cambridge University Press, Cambridge, 1996
3. Theory of Superconductivity
4. Theory of superconductivity;Schrieffer,1964
5. Superconductivity of metals and alloys;de Gennes,1966