@Article{
  dallaz09,
  author = { Gianni Dal Maso and Giuliano Lazzaroni },
  title = { Crack growth with non-interpenetration: a simplified proof for the pure Neumann problem },
  journal = { Discrete Contin. Dyn. Syst. (DCDS-A) },
  year = { 2011 },
  volume = { 31 },
  number = { 4 },
  pages = { 1219-1231 },
}