@Misc{ 
  laz09a,
  author = { Lazzaroni, Giuliano },
  title = { Some results in the variational theory of crack growth },
  journal = {  },
  year = { 2009 },
  pages = {  },
  URL = { http://cvgmt.sns.it/paper/1408/ },
  note = { cvgmt preprint}
}