@article{Ikeda:2010ms,
  author = "Ikeda, H.  and  Hashimoto, Shoji",
  title = "{$O(a^2)$ improvement of the overlap-Dirac operator}",
  doi = "10.22323/1.091.0082",
  journal = "PoS",
  year = 2010,
  volume = "LAT2009",
  pages = "082"
}