@Article{ 
  Cri19,
  author = { Crismale, Vito },
  title = { Density in $SBD$ and approximation of fracture energies },
  journal = { Atti Accad. Naz. Lincei Rend. Lincei Mat. Appl. },
  year = { 2019 },
  doi = { 10.4171/RLM/859 },
  volume = { 30 },
  number = { 3 },
  pages = { 533-542 },
  URL = { http://cvgmt.sns.it/paper/4234/ },
  note = { cvgmt preprint}
}