1. J.P. Lees et al., [BaBar Collaboration], Phys. Rev. Lett. 109, 101802 (2012)
2. J.P. Lees et al., [BaBar Collaboration], Phys. Rev. D 88, 072012 (2013)
3. R. Aaij et al., [LHCb Collaboration], Phys. Rev. Lett. 115, 1118031 (2015) (erratum: Phys. Rev. Lett. 115, 159901, 2015)
4. M. Huschle et al., [Belle Collaboration], Phys. Rev. D 92, 072014 (2015)
5. Y. Sato et al., [Belle Collaboration], Phys. Rev. D 94, 072007 (2016)