K. Okada

Nakajima, T., Okada, K., Wada, M., Dzuba, V. A., Safronova, M. S., Safronova, U. I., … Nakamura, N. (2017). Visible spectra of highly charged holmium ions observed with a compact electron beam ion trap. Nuclear Instruments & Methods in Physics Research Section B-Beam Interactions With Materials and Atoms, 408, 118–121. http://doi.org/10.1016/j.nimb.2017.03.135