@Article{ 
  gia05,
  author = { Giacomini, Alessandro },
  title = { Ambrosio-Tortorelli approximation of quasi-static evolution of brittle fractures },
  journal = { Calc. Var. Partial Differential Equations },
  year = { 2005 },
  volume = { 22 },
  pages = { 129-172 },
  URL = { http://cvgmt.sns.it/paper/1415/ },
  note = { cvgmt preprint}
}