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  date-added	= {2019-02-11 10:13:49 -0800},
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@Article{	  arnaldi:2009aa,
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@Article{	  aubert:2009mc,
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@Article{	  BABAR:2011ad,
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@Article{	  uehara:2012ag,
  archiveprefix	= {arXiv},
  author	= {Uehara, S. and others},
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@Article{	  aguar-bartolome:2013vpw,
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@Article{	  ablikim:2015wnx,
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@Article{	  masuda:2015yoh,
  archiveprefix	= {arXiv},
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  collaboration	= {Belle},
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@Article{	  arnaldi:2016pzu,
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  collaboration	= {NA60},
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@Article{	  adlarson:2016hpp,
  archiveprefix	= {arXiv},
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  year		= {2017},
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@Article{	  adlarson:2016ykr,
  archiveprefix	= {arXiv},
  author	= {Adlarson, P. and others},
  collaboration	= {A2},
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  year		= {2017},
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@Article{	  thena62:2016fhr,
  archiveprefix	= {arXiv},
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  collaboration	= {NA62},
  doi		= {10.1016/j.physletb.2017.02.042},
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  primaryclass	= {hep-ex},
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  year		= {2017},
  bdsk-url-1	= {https://doi.org/10.1016/j.physletb.2017.02.042}
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@Article{	  BABAR:2018zpn,
  archiveprefix	= {arXiv},
  author	= {Lees, J. P. and others},
  collaboration	= {BABAR},
  doi		= {10.1103/PhysRevD.98.112002},
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  year		= {2018},
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@Article{	  Larin:2020,
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  journal	= {Science},
  pages		= {506-509},
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  year		= {2020},
}