@article{GrueningerWindtBenckiseretal.2003,
  author    = {Markus Gr{\"u}ninger and Marco Windt and Eva Benckiser and Tamara Nunner and Kai P. Schmidt and G{\"o}tz S. Uhrig and Thilo Kopp},
  title     = {Optical spectroscopy of low-dimensional quantum spin systems},
  journal   = {Advances in Solid State Physics},
  volume    = {43},
  pages     = {95 -- 112},
  doi       = {10.1007/978-3-540-44838-9_7},
  year      = {2003},
}