1. Bardeen, J.: Rev. Mod. Phys. 23, 261 (1951). A review of attempts which have been made to calculate electron-phonon interaction energies for application to superconductivity.
2. Bardeen, J., and D. Pines: Phys. Rev. 99, 1140 (1955). Formulation of the electron-phonon interaction problem, including effects of Coulomb interactions.
3. Burton, E. F., and others: The Phenomenon of Superconductivity. Toronto 1934.
4. Fröhlich, H.: Phys. Rev. 79, 845 (1950). The basic paper of Fröhlich’s theory.
5. Ginsburg, W. L.: Fortschr. Phys. 1, 101 (1953). A review of theories of superconductivity, with consideration of the spectrum of elementary excitations. Good bibliography, particularly of work done in USSR.