@Misc{ 
  AmbColDiM12,
  author = { Ambrosio, Luigi and Colombo, Maria and Di Marino, Simone },
  title = { Sobolev spaces in metric measure spaces: reflexivity and lower
  semicontinuity of slope },
  journal = { Advanced Studies in Pure Mathematics: "Variational methods for evolving objects" },
  year = { 2012 },
  volume = { 67 },
  pages = { 1-58 },
  URL = { http://cvgmt.sns.it/paper/2055/ },
  note = { cvgmt preprint}
}