@article{Hallberg2006,
  author  = {K. Hallberg},
  title   = {New Trends in Density Matrix Renormalization},
  journal = {Adv. Phys.},
  volume  = {55},
  pages   = {477},
  year    = {2006},
  doi     = {10.1080/00018730600766432},
  eprint  = {cond-mat/0609039},
}