@phdthesis{30,
  keywords = {PhD thesis, thesis},
  author = {Nicolas Tancogne-Dejean},
  title = {Ab initio description of second-harmonic generation from crystal surfaces},
  year = {2015},
  volume = {PhD in Physics},
  publisher = {Ecole Polytechnique},
  address = {Ecole Polytechnique, Palaiseau},
}