Mesoscopic Fluctuations of Eigenfunctions and "Level Velocity"   Distribution in Disordered Metals
  We calculate the distribution of eigenfunction amplitudes and the variance of the ``inverse participation ratio'' (IPR) in disordered metallic samples. A relation is established between the distribution function of IPR and that of ``level velocities'' -- parametric derivatives of energy levels with respect to a random perturbation. 
Yan V.Fyodorov and Alexander D.Mirlin