@phdthesis{45,
  author = {Stefan Albrecht},
  title = {Optical Absorption Spectra of Semiconductors and Insulators: ab initio calculations of many-body effects},
  year = {1999},
  volume = {PhD in Physics},
  publisher = {Ecole Polytechnique},
  address = {Ecole Polytechnique, Palaiseau},
}