@Misc{ 
  DavSte23,
  author = { Davoli, Elisa and Stefanelli, Ulisse },
  title = { Level sets of solutions to the stationary Hamilton-Jakobi equation are John regular },
  journal = { Journal of Differential Equations },
  year = { 2026 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/6343/ },
  note = { cvgmt preprint}
}