1. R. Aaij et al. (LHCb Collab.), Phys. Rev. D 101, 032005 (2020), arXiv: 1911.05957 [hep-ex]; Phys. Rev. D 92, 032002 (2015); arXiv: 1505.01710 [hep-ex].
2. R. Aaij et al. (LHCb Collab.), Phys. Rev. D 94, 072001 (2016); arXiv: 1608.01289 [hep-ex].
3. LHCb Collab. (R. Aaij et al.), JHEP 1309, 145 (2013); arXiv: 1307.4556 [hep-ph].
4. P. del Amo Sanchez et al. (BaBaR Collab.), Phys. Rev. D 82, 111101 (2010);
5. B. Aubert et al. (BaBar Collab.), Phys. Rev. D 80, 092003 (2009); 79, 112004 (2009).