Reference Label	Details
Moore 1970	C. E. Moore, "Ionization Potentials and Ionization Limits Derived from Analyses of Optical Spectra", NSRDS-NBS 34, National Bureau of Standards: Washington, DC 1970
Garcia 1965	J. D. Garcia and J. E. Mack, J. Opt. Soc. America 55, 654-685 (1965) Energy Level and Line Tables for One-Electron Atomic Spectra