1. Z. Bern, J.J.M. Carrasco, L.J. Dixon, H. Johansson and R. Roiban, The Complete Four-Loop Four-Point Amplitude in N = 4 super-Yang-Mills Theory, Phys. Rev. D 82 (2010) 125040 [ arXiv:1008.3327 ] [ INSPIRE ].
2. 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 ].
3. 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 ].
4. 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 ].
5. Z. Bern, J.J.M. Carrasco and H. Johansson, The Structure of Multiloop Amplitudes in Gauge and Gravity Theories, Nucl. Phys. Proc. Suppl. 205-206 (2010) 54 [ arXiv:1007.4297 ] [ INSPIRE ].