@Article{ 
  BouCri12,
  author = { Bouchut, François and Crippa, Gianluca },
  title = { Lagrangian flows for vector fields with  gradient given by a singular integral },
  journal = { J. Hyper. Differential Equations },
  year = { 2013 },
  volume = { 10 },
  number = { 2 },
  pages = { 235-282 },
  URL = { http://cvgmt.sns.it/paper/1897/ },
  note = { cvgmt preprint}
}