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\bibitem{Guo_etal2013} Guo, F. K., Hidalgo-Duque, C., Nieves, J., \& Pavon Valderrama, M. (2013). Consequences of heavy-quark symmetries for hadronic molecules. \textit{Phys. Rev. D}, \textit{88}(5), 054007--5pp.

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