@Misc{ 
  Zha18,
  author = { Zhang, Yi Ru-Ya },
  title = { Schoenflies solutions of conformal boundary values may fail to be
  Sobolev },
  journal = {  },
  year = { 2018 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/6620/ },
  note = { cvgmt preprint}
}