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)