@Misc{ 
  San16a,
  author = { Santambrogio, Filippo },
  title = { Regularity via duality in calculus of variations and degenerate elliptic PDEs },
  journal = { Journal of Mathematical Analysis and Applications },
  year = { 2017 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/3174/ },
  note = { cvgmt preprint}
}