@Misc{ 
  CitStr23,
  author = { Citti, Giovanna and Stroffolini, Bianca },
  title = { Internal Schauder estimates for H\"ormander type equations with Dini continuous source },
  journal = {  },
  year = { 2023 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/6073/ },
  note = { cvgmt preprint}
}