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\bibitem{Xu_etal2019} Xu, S. S., Cui, Z. F., Chang, L., Papavassiliou, J., Roberts, C. D., \& Zong, H. S. (2019). New perspective on hybrid mesons. \textit{Eur. Phys. J. A}, \textit{55}(7), 113--6pp.

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