1. S.K. Choi et al. (Belle Collaboration), Phys. Rev. Lett. 91, 262001 (2003)
2. D. Acosta et al. (CDF Collaboration), Phys. Rev. Lett. 93, 072001 (2004)
3. V.M. Abazov et al. (D0 Collaboration), Phys. Rev. Lett. 93, 162002 (2004)
4. B. Aubert et al. (BABAR Collaboration), Phys. Rev. D 71, 071103 (2005)
5. B. Aubert et al. (BABAR Collaboration), Phys. Rev. D 73, 011101 (2006)