@article{white1993,
  author = {White, S. R.},
  title = {{Density-Matrix Algorithms for Quantum Renormalization Groups}},
  journal = {Physical Review B},
  volume = {48},
  number = {14},
  pages = {10345--10356},
  year = {1993},
  doi = {10.1103/PhysRevB.48.10345}
}