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\bibitem{Dai_etal2020} Dai, L. R., Toledo, G., \& Oset, E. (2020). Searching for a D(D)over-bar bound state with the psi(3770) -> gamma D-0(D)over-bar(0) decay. \textit{Eur. Phys. J. C}, \textit{80}(6), 510--8pp.

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