@Misc{ 
  BonGus19a,
  author = { Bonicatto, Paolo and Gusev, Nikolay },
  title = { On the structure of divergence-free measures on $\mathbb R^2$ },
  journal = {  },
  year = { 2019 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/4552/ },
  note = { cvgmt preprint}
}