@Article{ 
  negort07,
  author = { Negri, Matteo and Ortner, Christoph },
  title = { Quasi-static crack propagation by Griffith's criterion },
  journal = { Math. Models Methods Appl. Sci. },
  year = { 2008 },
  volume = { 18 },
  number = { 11 },
  pages = { 1895-1925 },
  URL = { http://cvgmt.sns.it/paper/328/ },
  note = { cvgmt preprint}
}