Atomic energy levels as derived from the analysis of optical spectra vol. I, the spectra of hydrogen, deuterium, tritium, helium, lithium, beryllium, boron, carbon, nitrogen, oxygen, fluorine, neon, sodium, magnesium, aluminium, silicon, phosphorus, sulfur, chlorine, argon, potassium, calcium, scandium, titanium and vanadium - Moore, C. E. (Washington U. S. Government Printing Office, 1949)
Keywords: Atomic energy levels; Optical spectra; Spectra of atoms