1. C. H. Corliss, W. R. Bozman: Experimental Transition Probabilities for Spectral Lines of Seventy Elements, NBS Mon. 53 (Govt. Printing Office, Washington, D.C. 1962)
2. J. M. Bridges, W. L. Wiese: Astrophys. J. 161, L71 1970)
3. M. Huber, W. H. Parkinson: Astrophys. J. 172, 229 (1972)
4. C. L. Cocke, A. Stark, J. C. Evans: Astrophys. J. 184, 653 1973)
5. W. E. Meggers, C. H. Corliss, B. F. Schribner: Tables of Spectral Line Intensities, NBS Mon. 32 (Govt. Printing Office, Washington, D.C. 1961)