@Misc{ 
  DePFig12c,
  author = { De Philippis, Guido and Figalli, Alessio },
  title = { Sobolev regularity for Monge-Ampère type equations },
  journal = { SIAM J. Math. Anal. },
  year = { 2012 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2024/ },
  note = { cvgmt preprint}
}