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The properties of low-energy excitations in a disordered system with localized electrons are discussed. A simple model and a self-consistent method for the calculation of the density of states are proposed. It is argued that in a three-dimensional system there are in fact no low-energy one-particle excitations, but many-particle charged excitations exist and determine the d.c. conductivity of the system. Formulae are given for the density of states of such excitations and for the d.c. conductivity.
A. L. Efros (Mon,) studied this question.
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