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J. Adams et al. [STAR Collaboration], \emph{Phys. Rev. Lett.} 94, 062301 (2005); 
B. I. Abelev et al. [STAR Collaboration], \emph{Phys. Rev. Lett.} 98, 192301 (2007); 
B. I. Abelev et al. [STAR Collaboration], \emph{Phys. Rev. Lett.} 106, 159902 (2011). 

\bibitem{refb}
M. M. Aggarwal et al. [STAR Collaboration], \emph{Phys. Rev. Lett.} 105, 202301 (2010).

\bibitem{refc}
H. Agakishiev et al. [STAR Collaboration],  \emph{Phys. Rev. D} 83, 52006 (2011).

\bibitem{refd}
M. Cacciari, \emph{Nucl. Phys. A} 783, 189 (2007); 
M. Cacciari, P. Nason and R. Vogt, \emph{Phys. Rev. Lett.} 95, 122001 (2005); R. Vogt, private communication.

\end{thebibliography}
