1. Blackwell, D. E., Petford, A. D., and Mallia, E. A.: 1967, Monthly Notices Roy. Astron. Soc. 136, 365.
2. Bowen, I. S.: 1948, Rev. Mod. Phys. 20, 109.
3. Cameron, R. C.: 1967, The Magnetic and Related Stars, Mono Book Corporation, Baltimore, p. 397.
4. Corliss, C. H. and Bozman, W. R.: 1962, National Bureau of Standards, Monograph 53.
5. Davis, S. P. and Phillips, J. G.: 1963, The Red System (A 2?-X2 ?) of the CN Molecule, University of California Press, Berkeley, Calif.