@Article{ 
  lorb,
  author = { Lorent, Andrew },
  title = { On functions whose symmetric part of gradient agree and a generalization of Reshetnyak's compactness theorem },
  journal = { Calculus of Variations and PDE },
  year = { 2013 },
  volume = { 48 },
  number = { 3-4 },
  pages = { 625-665 },
  URL = { http://cvgmt.sns.it/paper/1356/ },
  note = { cvgmt preprint}
}