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\bibitem{LHCbCollaborationAaij_etal2021} LHCb Collaboration(Aaij, R. et al), Henry, L., Jashal, B. K., Martinez-Vidal, F., Oyanguren, A., Remon Alepuz, C., et al. (2021). Observation of Multiplicity Dependent Prompt chi(c1) (3872) and psi (2S) Production in pp Collisions. \textit{Phys. Rev. Lett.}, \textit{126}(9), 092001--11pp.

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