1. S. Sachdev and J. Ye, Gapless spin fluid ground state in a random, quantum Heisenberg magnet, Phys. Rev. Lett. 70 (1993) 3339 [ cond-mat/9212030 ] [ INSPIRE ].
2. A. Kitaev, A simple model of quantum holography (part 1), talk at KITP, http://online.kitp.ucsb.edu/online/entangled15/kitaev/ , University of California, Santa Barbara U.S.A., 7 April 2015.
3. A. Kitaev, A simple model of quantum holography (part 2), talk at KITP, http://online.kitp.ucsb.edu/online/entangled15/kitaev2/ , University of California, Santa Barbara U.S.A., 27 May 2015.
4. J. Polchinski and V. Rosenhaus, The spectrum in the Sachdev-Ye-Kitaev model, JHEP 04 (2016) 001 [ arXiv:1601.06768 ] [ INSPIRE ].
5. J. Maldacena and D. Stanford, Remarks on the Sachdev-Ye-Kitaev model, Phys. Rev. D 94 (2016) 106002 [ arXiv:1604.07818 ] [ INSPIRE ].