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VOLUME 37 | ISSUE 9 | PAGE 517
On the frequency and temperature dependence of the conductivity near a metal-insulator transition
The metal-insulator transition is examined for interacting electrons in a disordered system. The renormalization-group equations are derived for two cases: transitions in a magnetic field and transitions in the presence of magnetic impurities. It is shown that in the critical region the frequency or temperature dependence of the conductivity is governed by a new invariant charge z.

Permission given by American Institute of Physics is appreciated.