1. J.M. Maldacena, The Large-N limit of superconformal field theories and supergravity, Adv. Theor. Math. Phys. 2 (1998) 231 [Int. J. Theor. Phys. 38 (1999) 1113] [ hep-th/9711200 ] [ INSPIRE ].
2. S.A. Hartnoll, Horizons, holography and condensed matter, arXiv:1106.4324 [ INSPIRE ].
3. S. Kachru, X. Liu and M. Mulligan, Gravity duals of Lifshitz-like fixed points, Phys. Rev. D 78 (2008) 106005 [ arXiv:0808.1725 ] [ INSPIRE ].
4. D.T. Son, Toward an AdS/cold atoms correspondence: A Geometric realization of the Schrödinger symmetry, Phys. Rev. D 78 (2008) 046003 [ arXiv:0804.3972 ] [ INSPIRE ].
5. K. Balasubramanian and J. McGreevy, Gravity duals for non-relativistic CFTs, Phys. Rev. Lett. 101 (2008) 061601 [ arXiv:0804.4053 ] [ INSPIRE ].