| 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 |
| Johansson 1966 | L. Johansson, Ark. Fys. 31, 201-235 (1966) Spectrum and Term System of the Neutral Carbon Atom |