Normal and superconducting state in the presence of forward electron-phonon and impurity scattering O. V. Danylenko, O. V. Dolgov, M. L. Kulić and V. Oudovenko Eur. Phys. J. B, 9 2 (1999) 201-206 Published online: 15 May 1999 DOI: 10.1007/s100510050757