Novel Transport Mechanism for Interacting Electrons in Disordered   Systems: Variable-Range Resonant Tunneling
  To interpret recent experimental observations of the phononless hopping conduction, we suggest a novel transport mechanism according to which the current-carrying single electrons move via quantum resonant tunneling between localized states brought into resonance by fast electron hops in their environment. 
S.D. Baranovskii and I.S. Shlimak