@Misc{ 
  Mor15,
  author = { Mora, Maria Giovanna },
  title = { Relaxation of the Hencky model  in perfect plasticity },
  journal = {  },
  year = { 2015 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/2788/ },
  note = { cvgmt preprint}
}