@Article{ 
  DeLFoc12,
  author = { De Lellis, Camillo and Focardi, Matteo },
  title = { Higher integrability of the gradient for minimizers of the 2d Mumford-Shah energy  },
  journal = { J. Math. Pures Appl. },
  year = { 2013 },
  doi = { http://dx.doi.org/10.1016/j.matpur.2013.01.006 },
  volume = { 100 },
  pages = { 391-409 },
  URL = { http://cvgmt.sns.it/paper/1761/ },
  note = { cvgmt preprint}
}