1. D. Gaiotto and E. Witten, Janus configurations, Chern-Simons couplings, and the theta-angle in N = 4 super Yang-Mills theory, arXiv:0804.2907 [ SPIRES ].
2. O. Aharony, O. Bergman, D.L. Jafferis and J. Maldacena, N=6 superconformal Chern-Simons-matter theories, M2-branes and their gravity duals, JHEP 10 (2008) 091 [ arXiv:0806.1218 ] [ SPIRES ].
3. J. Bagger and N. Lambert, Gauge symmetry and supersymmetry of multiple M2-branes, Phys. Rev. D 77 (2008) 065008 [ arXiv:0711.0955 ] [ SPIRES ].
4. V. Pestun, Localization of gauge theory on a four-sphere and supersymmetric Wilson loops, arXiv:0712.2824 [ SPIRES ].
5. J.H. Schwarz, Superconformal Chern-Simons theories, JHEP 11 (2004) 078 [ hep-th/0411077 ] [ SPIRES ].