On electric resistances for distance-regular graphs
  We investigate the behavior of electric potentials on distance-regular graphs, and extend some results of a prior paper. Our main result, Theorem 4, shows(together with Corollary 3) that if distance is measured by the electric resistance between points then all points are close to being equidistant on a distance-regular graph with large valency. A number of auxiliary results are also presented. 
Jack Koolen, Greg Markowsky, and Jongyook Park
math.CO