@inproceedings{Johansson:2013CU,
  author = "Johansson, Henrik  and  Kosower, David A  and  Larsen, Kasper",
  title = "{Maximal unitarity at two loops}",
  doi = "10.22323/1.151.0066",
  booktitle = "Proceedings of “Loops and Legs in Quantum Field Theory ” 11th DESY Workshop on Elementary Particle Physics  {\textemdash} PoS(LL2012)",
  year = 2013,
  volume = "151",
  pages = "066"
}