1. N Hammon et. al, Phys. Rev. C61 014901 (1999)
2. STAR Collaboration Phys. Lett. B567 167 (2003)
3. BRAHMS Collaboration Phys. Lett. B607 42 (2005)
4. D Dutta, A K Mohanty, K Kumar and R K Choudhury Phys. Rev. C60 014905 (1999)
5. D Dutta, A K Mohanty, K Kumar and R K Choudhury Phys. Rev. C61 064911 (2000)