@Article{ 
  laztoa10,
  author = { Lazzaroni, Giuliano and Toader, Rodica },
  title = { A model for crack propagation based on viscous approximation },
  journal = { Math. Models Methods Appl. Sci. },
  year = { 2011 },
  volume = { 21 },
  pages = { 2019-2047 },
  URL = { http://cvgmt.sns.it/paper/1632/ },
  note = { cvgmt preprint}
}