@Article{ 
  Woz23a,
  author = { Wozniak, Piotr },
  title = { Sobolev regularity for linear growth functionals acting on $\mathbb{C}$-elliptic operators },
  journal = { The Quarterly Journal of Mathematics },
  year = { 2023 },
  doi = { https://doi.org/10.1093/qmath/haac022 },
  volume = { 74 },
  number = { 1 },
  pages = { 273–299 },
  URL = { http://cvgmt.sns.it/paper/6108/ },
  note = { cvgmt preprint}
}