@article{hirschfye1986,
  author = {Hirsch, J. E. and Fye, R. M.},
  title = {{Monte Carlo Method for Magnetic Impurities in Metals}},
  journal = {Physical Review Letters},
  volume = {56},
  number = {23},
  pages = {2521--2524},
  year = {1986},
  doi = {10.1103/PhysRevLett.56.2521}
}