Yv. Fyodorov, DISTRIBUTION OF LEVEL VELOCITIES IN QUASI-1D DISORDERED OR CHAOTIC SYSTEMS WITH LOCALIZATION, Physical review letters, 73(20), 1994, pp. 2688-2691
The explicit analytic expression for the distribution function of para
metric derivatives of energy levels (''level velocities'') is derived
for the chaotic quantum systems belonging to the quasi-1D universality
class (quantum kicked rotator, ''domino'' billiard, disordered wire,
etc.).