@inproceedings{Perkins:2009rH,
  author = "Perkins, Warren  and  Warrick, Edmund",
  title = "{Unitarity Methods For Massless One-Loop Amplitudes}",
  doi = "10.22323/1.070.0104",
  booktitle = "Proceedings of XII Advanced Computing and Analysis Techniques in Physics Research {\textemdash} PoS(ACAT08)",
  year = 2009,
  volume = "070",
  pages = "104"
}