@inproceedings{vonHippel:2009K8,
  author = "von Hippel, Georg",
  title = "{Perturbative improvement with HISQ fermions: the gluon action at $O(N_f \alpha_s a^2)$ }",
  doi = "10.22323/1.066.0046",
  booktitle = "Proceedings of The XXVI International Symposium on Lattice Field Theory  {\textemdash} PoS(LATTICE 2008)",
  year = 2009,
  volume = "066",
  pages = "046"
}