@article{Frommer:2012q/,
  author = "Frommer, Andreas  and  Kahl, Karsten  and  Lippert, Thomas  and  Rittich, H.",
  title = "{Accurate error bounds and estimates for the sign function}",
  doi = "10.22323/1.139.0032",
  journal = "PoS",
  year = 2012,
  volume = "Lattice 2011",
  pages = "032"
}