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1958
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V. Baru, J. Haidenbauer, C. Hanhart, Yu. Kalashnikova and A. E. Kudryavtsev, Evidence that the a 0 ( 980 ) a_{0}(980) and f 0 ( 980 ) f_{0}(980) are not elementary particles , Phys. Lett. B586
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N. Brambilla et al., Heavy quarkonium: progress, puzzles, and opportunities , Eur. Phys. J. C71
2011
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2011
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2011
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2011
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F.-K. Guo and U.-G. Meißner, Where is the χ c 0 ( 2 P ) \chi_{c0}(2P) ? , Phys. Rev. D86
2015
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2015
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2015
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2015
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2012
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2013
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2013
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2013
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2013
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2014
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S. L. Olsen, Is the X(3915) the χ c 0 ( 2 P ) \chi_{c0}(2P) ? , Phys. Rev. D91
2015
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2015
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2015
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2016
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