Conductivity exponents at the percolation threshold
  Connections are found between the two-component percolation problem and the conductor/insulator percolation problem. These produce relations between critical exponents, and suggest formulae connecting the conductivity exponents in different dimensions. Values for the critical exponents are obtained from calculations on the incipient infinite cluster in two and three dimensions. 
Clinton DeW. Van Siclen
cond-mat.stat-mech