@article{Kreimer:20135d,
  author = "Kreimer, Dirk  and  Brown, Francis",
  title = "{Decomposing Feynman rules}",
  doi = "10.22323/1.151.0049",
  journal = "PoS",
  year = 2013,
  volume = "LL2012",
  pages = "049"
}