@Misc{ 
  chisan03,
  author = { Chiadò Piat, Valeria and Sandrakov, Gennadyi },
  title = { Homogenization of some variational inequalities for elasto-plastic problems },
  journal = {  },
  year = { 2003 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/1577/ },
  note = { cvgmt preprint}
}