@Misc{ 
  BucSqu19,
  author = { Bucur, Claudia and Squassina, Marco },
  title = { Approximate convexity principles and applications to PDEs in convex domains },
  journal = {  },
  year = { 2019 },
  pages = { 20 },
  URL = { http://cvgmt.sns.it/paper/4227/ },
  note = { cvgmt preprint}
}