@Article{ 
  DeLFoc12a,
  author = { De Lellis, Camillo and Focardi, Matteo },
  title = { Density lower bound estimates for local minimizers of the 2d Mumford-Shah energy },
  journal = { Manuscripta Math. },
  year = { 2013 },
  doi = { 10.1007/s00229-012-0601-y },
  volume = { 132 },
  pages = { 215-232 },
  URL = { http://cvgmt.sns.it/paper/1813/ },
  note = { cvgmt preprint}
}