@article{BarthelSchollwockWhite2009,
  author    = {Thomas Barthel and Ulrich Schollwock and Steven R. White},
  title     = {Spectral functions in one-dimensional quantum systems at finite temperature using the density matrix renormalization group},
  doi       = {10.1103/Physrevb.79.245101},
  url       = {http://prb.aps.org/},
  year      = {2009},
}