1. Z. Bern, J.J.M. Carrasco and H. Johansson, New relations for gauge-theory amplitudes, Phys. Rev. D 78 (2008) 085011 [ arXiv:0805.3993 ] [ INSPIRE ].
2. Z. Bern, J.J.M. Carrasco and H. Johansson, Perturbative quantum gravity as a double copy of gauge theory, Phys. Rev. Lett. 105 (2010) 061602 [ arXiv:1004.0476 ] [ INSPIRE ].
3. Z. Bern, J.J.M. Carrasco, L.J. Dixon, H. Johansson and R. Roiban, Manifest ultraviolet behavior for the three-loop four-point amplitude of N = 8 supergravity, Phys. Rev. D 78 (2008) 105019 [ arXiv:0808.4112 ] [ INSPIRE ].
4. Z. Bern, J.J. Carrasco, L.J. Dixon, H. Johansson and R. Roiban, The ultraviolet behavior of N =8 supergravity at four loops, Phys. Rev. Lett. 103 (2009) 081301 [ arXiv:0905.2326 ] [ INSPIRE ].
5. J.J. Carrasco and H. Johansson, Five-point amplitudes in N = 4 Super-Yang-Mills theory and N = 8 supergravity, Phys. Rev. D 85 (2012) 025006 [ arXiv:1106.4711 ] [ INSPIRE ].