Black hole/string transition for the small Schwarzschild black hole of AdS 5 × S5 and critical unitary matrix modelsL. Álvarez-Gaumé, P. Basu, M. Mariño and S.R. WadiaEur. Phys. J. C, 48 2 (2006) 647-665DOI: https://doi.org/10.1140/epjc/s10052-006-0049-x