1. J.P. Lees et al., BaBar collaboration. Phys. Rev. Lett. 109, 101802 (2012). arXiv:1205.5442 [hep-ex]
2. J.P. Lees et al., BaBar collaboration. Phys. Rev. D 88, no. 7, 072012 (2013) arXiv:1303.0571 [hep-ex]
3. M. Huschle et al., Belle collaboration. Phys. Rev. D 92, no. 7, 072014 (2015) arXiv:1507.03233 [hep-ex]
4. Y. Sato et al., Belle Collaboration. Phys. Rev. D 94 7, 072007 (2016). arXiv:1607.07923 [hep-ex]
5. S. Hirose et al., Belle collaboration. Phys. Rev. Lett. 11821, 211801 (2017). arXiv:1612.00529 [hep-ex]