@Misc{ 
  ambfig07a,
  author = { Ambrosio, Luigi and Figalli, Alessio },
  title = { On the regularity of the pressure field of Brenier's weak solutions to incompressible Euler equations },
  journal = { Calc. Var. Partial Differential Equations },
  year = { 2007 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/1189/ },
  note = { cvgmt preprint}
}