  A single-particle spectral density is proposed for cuprates taking into
account the bipolaron formation, realistic band structure, thermal fluctuations
and disorder. Tunnelling and photoemission (PES) spectra are described,
including the temperature independent gap observed both in the superconducting
and normal states, the emission/injection asymmetry, the finite zero-bias
conductance, the spectral shape in the gap region and its temperature and
doping dependence, dip-hump incoherent asymmetric features at high voltage
(tunnelling) and large binding energy (PES).
