1. For recent reviews see S. Gupta, J. Phys G35, 104018 (2008), M.P. Lombardo, J. Phys G35, 104019 (2008) and K. Fukushima, J. Phys G35, 104020 (2008).
2. E.V. Shuryak, Phys. Lett. B78, 150 (1978).
3. P.V. Ruuskanen, Nucl. Phys. A544, 169c (1992).
4. S. Turbide, R. Rapp and C. Gale, Phys. Rev. C69, 014903 (2004) and Int. J. Mod. Phys. A19, 5351 (2004).
5. A. Adare et al. (PHENIX Collaboration), arXiv:0804.4168.