The sharp forward electron-phonon (FEP) and impurity (FIS) scattering chang
e the normal and superconducting properties significantly. The pseudo-gap l
ike features are present in the density of states for omega < Omega, where
Omega is the phonon frequency. The superconducting critical temperature T-c
, due to the FEP pairing, is linear with respect to the electron-phonon cou
pling constant. The FIS impurities are pair weakening for s- and d-wave pai
ring.