Charmonium resonances in the 3.9 GeV/$c^2$ energy region and the $X(3915)/X(3930)$ puzzle

  title={Charmonium resonances in the 3.9 GeV/\$c^2\$ energy region and the \$X(3915)/X(3930)\$ puzzle},
  author={Pablo G. Ortega and Jorge Segovia and David R. Entem and Francisco M. Fern'andez},
  journal={Physics Letters B},
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