Wasserstein Distance and the Rectifiability of Doubling Measures: Part   II
  We study the structure of the support of a doubling measure by analyzing its self-similarity properties, which we estimate using a variant of the $L^1$ Wasserstein distance. We show that measure satisfying certain self-similarity conditions admits a unique (up to multiplication by a constant) flat tangent measure at almost every point. This allows us to decompose the support into rectifiable pieces of various dimensions. 
Jonas Azzam, Guy David and Tatiana Toro
math.MG