@article{hafermann2013,
  author = {Hafermann, H. and Werner, P. and Gull, E.},
  title = {{Efficient implementation of the continuous-time hybridization expansion quantum impurity solver}},
  journal = {Computer Physics Communications},
  volume = {184},
  number = {4},
  pages = {1280--1286},
  year = {2013},
  doi = {10.1016/j.cpc.2012.12.013}
}