1. S.-S. Lee, A non-Fermi liquid from a charged black hole: a critical Fermi ball, Phys. Rev. D 79 (2009) 086006 [ arXiv:0809.3402 ] [ INSPIRE ].
2. H. Liu, J. McGreevy and D. Vegh, Non-Fermi liquids from holography, Phys. Rev. D 83 (2011) 065029 [ arXiv:0903.2477 ] [ INSPIRE ].
3. M. Cubrovic, J. Zaanen and K. Schalm, String theory, quantum phase transitions and the emergent Fermi-liquid, Science 325 (2009) 439 [ arXiv:0904.1993 ] [ INSPIRE ].
4. T. Faulkner, H. Liu, J. McGreevy and D. Vegh, Emergent quantum criticality, Fermi surfaces and AdS 2, Phys. Rev. D 83 (2011) 125002 [ arXiv:0907.2694 ] [ INSPIRE ].
5. R.-H. He et al., From a single-band metal to a high-temperature superconductor via two thermal phase transitions, Science 331 (2011) 1579 [ arXiv:1103.2329 ] [arXiv:1103.2363].