1. R. Roiban, M. Spradlin and A. Volovich, Scattering amplitudes in gauge theories: progress and outlook, J. Phys. A 44 (2011) 450301.
2. N. Beisert, The SU(2|2) dynamic S-matrix, Adv. Theor. Math. Phys. 12 (2008) 945 [ hep-th/0511082 ] [ INSPIRE ].
3. G. Arutyunov and S. Frolov, Foundations of the AdS 5 × S 5 superstring. Part I, J. Phys. A 42 (2009) 254003 [ arXiv:0901.4937 ] [ INSPIRE ].
4. N. Beisert et al., Review of AdS/CFT integrability: an overview, Lett. Math. Phys. 99 (2012) 3 [ arXiv:1012.3982 ] [ INSPIRE ].
5. T. Klose and K. Zarembo, Bethe ansatz in stringy σ-models, J. Stat. Mech. 0605 (2006) P05006 [ hep-th/0603039 ] [ INSPIRE ].