@article{Troyer2003wl,
  author  = {M. Troyer and S. Wessel and F. Alet},
  title   = {Wang-{L}andau Sampling for Quantum Systems: Algorithms to Overcome Tunneling Problems and Calculate the Free Energy},
  journal = {Phys. Rev. Lett.},
  volume  = {90},
  pages   = {120201},
  year    = {2003},
  doi     = {10.1103/PhysRevLett.90.120201},
  eprint  = {cond-mat/0207138},
}