@Misc{ 
  FriSch15,
  author = { Friedrich, Manuel and Schmidt, Bernd },
  title = { A quantitative geometric rigidity result in SBD },
  journal = {  },
  year = { 2015 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2723/ },
  note = { cvgmt preprint}
}