@Misc{ 
  Amb11,
  author = { Ambrosio, Luigi },
  title = { An overview on calculus and heat flow in metric measure spaces and spaces with Riemannian curvature bounded from below },
  journal = {  },
  year = { 2011 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/1690/ },
  note = { cvgmt preprint}
}