@Article{ 
  sol09,
  author = { Solombrino, Francesco },
  title = { Quasistatic evolution problems for nonhomogeneous elastic plastic materials },
  journal = { Journal of convex analysis  },
  year = { 2009 },
  doi = { jca16005 },
  volume = { 16 },
  number = { 1 },
  pages = { 89-119 },
  URL = { http://cvgmt.sns.it/paper/820/ },
  note = { cvgmt preprint}
}