@Article{ 
  AndFoc22,
  author = { Andreucci , Giovanna and Focardi, Matteo },
  title = { The classical obstacle problem with H\"older continuous coefficients },
  journal = { Nonlinear Anal. },
  year = { 2023 },
  volume = { 226 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/5508/ },
  note = { cvgmt preprint}
}