@article{Werner2006,
  author  = {P. Werner and A. Comanac and L. {de' Medici} and M. Troyer and A. J. Millis},
  title   = {Continuous-Time Solver for Quantum Impurity Models},
  journal = {Phys. Rev. Lett.},
  volume  = {97},
  pages   = {076405},
  year    = {2006},
  doi     = {10.1103/PhysRevLett.97.076405},
  eprint  = {cond-mat/0512727},
}