@Misc{ 
  CsaDacSil17,
  author = { Csato, Gyula and Dacorogna, Bernard and Sil, Swarnendu },
  title = { On the best constant in {G}affney inequality },
  journal = {  },
  year = { 2017 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/5333/ },
  note = { cvgmt preprint}
}