@article{BarthelKlieschEisert2010,
  author    = {Thomas Barthel and Martin Kliesch and Jens Eisert},
  title     = {Real-space renormalization yields finite correlations},
  doi       = {10.1103/Physrevlett.105.010502},
  url       = {http://prl.aps.org/},
  year      = {2010},
}