@Article{ 
  GigHan15a,
  author = { Gigli, Nicola and Han, Bangxian },
  title = { The continuity equation on metric measure spaces },
  journal = { Calculus of Variations and Partial Differential Equations },
  year = { 2015 },
  volume = { 53 },
  pages = { 149-177 },
  URL = { http://cvgmt.sns.it/paper/2865/ },
  note = { cvgmt preprint}
}