Edwards, K. ., Janicek, R. ., Patel, P. ., Sadoff, A. ., Ammar, R. ., Bean, A. ., … Williams, J. . (2001). Study of B Decays to Charmonium States: B-->eta(c)K and B --> chi(c0)K. Physical Review Letters, 86(1), 30-34. Retrieved from http://link.aps.org/abstract/PRL/v86/p30 (Original work published 2001)

Brandenburg, G. ., Ershov, A. ., Gao, Y. ., Kim, D. ., Wilson, R. ., Browder, T. ., … CLEO, C. . (2000). Measurements of the mass, total width, and two-photon partial width of the eta(c) meson. Physical Review Letters, 85(15), 3095-9. Retrieved from http://link.aps.org/abstract/PRL/v85/p3095 (Original work published 2000)

Abdesselam, A. ., Adachi, I. ., Adametz, A. ., Adye, T. ., Ahmed, H. ., Aihara, H. ., … Belle, C. . (2015). First Observation of CP Violation in B over ¯ ^ 0 →D_ CP ^ (*) h^ 0 Decays by a Combined Time-Dependent Analysis of BABAR and Belle Data. Physical Review Letters, 115(12), 121604. https://doi.org/10.1103/PhysRevLett.115.121604 (Original work published 2015)