1. Abulencia, A., et al. [CDF Collaboration]: Phys. Rev. Lett. 97, 242003 (2006)
2. Aaij, R., et al. [LHCb Collaboration]: Phys. Rev. Lett. 108, 101803 (2012)
3. Tanabashi, M., et al. [Particle Data Group]: Phys. Rev. D 98, 030001 (2018). http://pdg.lbl.gov/
4. Gómez-Ceballos, G.: Talk at Flavor Physics and CP Violation Conference (FPCP2006), Vancouver, Canada, April 2006
5. CKMfitter Group: http://ckmfitter.in2p3.fr