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\bibitem{Brambilla+Sanchis-Lozano2011} Brambilla, N. et al, \& Sanchis-Lozano, M. A. (2011). Heavy quarkonium: progress, puzzles, and opportunities. \textit{Eur. Phys. J. C}, \textit{71}(2), 1534--178pp.

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