Distribution of "level velocities" in quasi 1D disordered or chaotic   systems with localization
  The explicit analytical expression for the distribution function of parametric derivatives of energy levels ("level velocities") with respect to a random change of scattering potential is derived for the chaotic quantum systems belonging to the quasi 1D universality class (quantum kicked rotator, "domino" billiard, disordered wire, etc.). 
Yan V. Fyodorov