[1] (a) Chapter III, p. 107.
(c) Appendix p. 521.
Herzberg, G.; Spectra of Diatomic Molecules, New York, Van Norstrand.
(b) Chapter III,p. 124.
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[3] G. J. Schulz;Phys. Rev.,1964, A135, 988.
[4] W. L. Nighan; Appl. Phys. Lett., 1972, 20,96.