1. Watson, W. W.Phys. Rev., 1938,53, 639.
2. Gatterer, A. and Krishnamurty, S. G.J. Opt. Soc. Amer., 1952,42, 143.
3. Rosen, B. and Swensson, J. SeeMolecular Spectra of Metallic Oxides by Gatterer, A., Junkes, J. and Salpeter, E. W. with the co-operation of Rosen, B., 1957,Specola Vaticana, p. 59.
4. Hautecler, S.Ibid.
5. Herzberg, G.Molecular Spectra and Molecuar Structure—I. Spectra of Diatomic Molecules, Van Nostrand, Princeton, N.J., 1950.