1. G. Herzberg, Atomic Spectra and Atomic Structure, Dover, New York (1944).
2. National Standard Reference Data Series;CE Moore,1971
3. C. Corliss and J. Sugar, “Energy Levels of Iron, Fe I through Fe XXVI,” J. Phys. Chem. Ref. Data, 11, 135 (1982) and numerous other papers which have appeared in this journal over the past years.
4. E. U. Condon and G. H. Shortley, The Theory of Atomic Spectra, Cambridge University Press, Cambridge (1967).
5. E. U. Condon and H. Odabasi, Atomic Structure, Cambridge University Press, Cambridge (1980).