@Misc{ 
  AmbGhe15,
  author = { Ambrosio, Luigi and Ghezzi, Roberta },
  title = { Sobolev and Bounded Variation Functions on Metric Measure Spaces },
  journal = {  },
  year = { 2015 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2738/ },
  note = { cvgmt preprint}
}