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The Boltzmann - Langevin approach is extended to calculations of third andfourth cumulants of current in diffusive-metal contacts. These cumulants resultfrom indirect correlations between current fluctuations, which may beconsidered as "noise of noise". The calculated third cumulant coincides exactlywith its quantum-mechanical value. The fourth cumulant tends to itsquantum-mechanical value $-e^3I/105$ at high voltages and to a positive value$2e^2T/3R$ at V=0 changing its sign at $eV \sim 20T$.Comment: 6 pages, 2 eps figures, typo corrected, minor change

Cascade Boltzmann-Langevin approach to higher-order current correlations in diffusive metal contacts