@article{Chiarappa:2005HU,
  author = "Chiarappa, Thomas  and  Frezzotti, Roberto  and  Urbach, Carsten",
  title = "{A (P)HMC algorithm for N_F=2+1+1 flavours of twisted mass fermions }",
  doi = "10.22323/1.020.0103",
  journal = "PoS",
  year = 2005,
  volume = "LAT2005",
  pages = "103"
}