@Article{ 
  DalOrlToa14,
  author = { Dal Maso, Gianni and Orlando, Gianluca and Toader, Rodica },
  title = { Laplace equation in a domain with a rectilinear crack: higher order derivatives of the energy with respect to the crack length },
  journal = {  NoDEA Nonlinear Differential Equations Appl. },
  year = { 2015 },
  doi = { 10.1007/s00030-014-0291-0 },
  volume = { 22 },
  number = { 3 },
  pages = { 449--476 },
  URL = { http://cvgmt.sns.it/paper/2389/ },
  note = { cvgmt preprint}
}